I have been running two more threads and just tried combining yours with my 
other three images and it does yield a noticable improvement. Only catch is 
that I have been running a new version of the scene to help increase the 
brightness, so if anyone else wants to try this just use the scene below. I 
need to get to work but will post an averaged version of these pics when I 
get home tonight.

#include "colors.inc"

global_settings {
  assumed_gamma 1.0
  max_trace_level 10
  montecarlo
  {
    mc_rand_seed
    mc_max_diffuse_bounce 2
    //mc_pixel_refresh_ratio 0.5
    mc_colour_clip 1

  }
}


default { finish { diffuse 1 ambient 0 montecarlo { mc_diffuse { 1 4 3 } 
mc_use_cosine_distrib
} } }

/*
camera {
up 1*y
right 350/700*x
location <-32, -5, -40> look_at <0, -5, 0> angle 50
}
*/

camera {

up 300
right 400*x//right 700/1400*x
//location <-32, -5, -40> look_at <0, -5, 0> angle 50
location 1*<-32, 0, -40> look_at <0, 0, 0> angle 60
}

light_source {<0, 50, 0> color rgb <.96, .96, 1> fade_distance 40
area_light <10, 0, 0>, <0, 0, 10>, 10, 10
jitter
}

//light_source {<-30, 28, 0> color White fade_distance 10}

//light_source {<30, 28, 0> color White fade_distance 10}

//sky

cylinder {<0, 60, 0>, <0, 65, 0>, 100
pigment {color rgb <.9,.9, 1>}
finish {ambient 2*15 }
montecarlo {
//mc_sky { 500 }
mc_portal { 2*24 2*8 4 4 }
//mc_portal { 4 2 1 1 }
}
}

#declare Tile_floor1 =
pigment {
gradient z
color_map {
[0 .5 color DarkWood color DarkWood]
[.5 1 color LightWood color LightWood]
}
}

#declare Tile_floor2 =
pigment {
gradient x
color_map {
[0 .5 color DarkWood color DarkWood]
[.5 1 color LightWood color LightWood]
}
}

#declare black_and_brown =
texture {
pigment {
gradient y
color_map {
[0 .5 color rgb <.65, .54, .48> color rgb <.65, .54, .48>]
[.5 1 color Black color Black]
}
}
finish {diffuse .8}
}

#declare nice_wood =
pigment {
gradient x
turbulence .02
color_map {
[0 .3 color rgb <.8, .5, .3> color rgb <.8, .5, .3>]
[.5 .8 color rgb <1, .7, .5> color rgb <1, .7, .5>]
}
scale .05
}

#declare roof_texture =
texture {
pigment {
gradient z
pigment_map {
[0 nice_wood]
[.47 nice_wood]
[.5 color DarkWood]
[.53 nice_wood]
[1 nice_wood]
}
scale 4
}
finish {diffuse .8 ambient 0}
}

#declare roof = union {
difference {
box {<-80, 29.5, -80>, <80, 80, 80>
texture {roof_texture}
}
box {<-15, 31, 0>, <15, 45, 30>
pigment {color White}
finish {ambient 0 diffuse .7}
}
//widened hole in skylight
cylinder {<10, 45, 0>, <30, 45, 0>, 15
pigment {color White}
finish {ambient 0 diffuse .8}
}

}

difference {
cylinder {<0, 29, 0>, <0, 60, 0>, 17.5
pigment {color White}
finish {diffuse .9 ambient 0}
}

cylinder {<5, 45, 0>, <20, 45, 0>, 8
pigment {color White}
finish {ambient 0 diffuse 0} //hole in skylight
}
}

difference {
union { //supports in hole in skylight
box {<10, 37, -1>, <18, 53, 1>}
box {<10, 44, -10>, <18, 46, 10>}
}
cylinder {<0, 29, 0>, <0, 60, 0>, 18 inverse}
pigment {color White}
finish {ambient 0 diffuse .8}
}

}


difference {
object {roof}

cylinder {<0, 25, 0>, <0, 61, 0>, 14
pigment {color White}
finish {diffuse .8 ambient 0}
}

box {<-10, 31, 0>, <10, 40, 40>
pigment {color White}
finish {diffuse .8 ambient 0}
}

}


//light in hole
//light_source {<25, 40, 0> color 0.3*White fade_distance 5 fade_power 3}


//a light
//light_source {<0, 35, 40> color 0.3*White fade_distance 5 fade_power 3}

//stairs
union {

box {<-10, 20, 1>, <10, 28, 18>}

box {<-10, 2, 1>, <10, 10, 18>}

#declare change = 0;
#while (change < 11)
box {<-10, 19-change, 8+change>, <10, 20-change, 18>}
light_source {<-7.5, 18.9-change, 8.5+change> color <.22, .22, .2> 
fade_distance 1 fade_power 3}
light_source {<7.5, 18.9-change, 8.5+change> color rgb <.22, .22, .2> 
fade_distance 1 fade_power 3}
box {<-8, 18.9-change, 8.4+change>, <-7, 19.5-change, 8.6+change>
pigment {color rgb <1.2, 1.2, 1>} finish {ambient 1} no_shadow
}

box {<-10, 1-change, 8+change>, <10, 2-change, 18>}
light_source {<-7.5, .9-change, 8.5+change> color rgb <.22, .22, .2> 
fade_distance 1 fade_power 3}
light_source {<-7.5, .9-change, 8.5+change> color rgb <.22, .22, .2> 
fade_distance 1 fade_power 3}
#declare change = change +1;
#end

texture {
pigment {color White}
//finish {diffuse .9 ambient 0}
}

}


//dark striped
union {

box {<-10, -15, 1>, <10, -4, 12>}

box {<-5, -15, 3>, <-3, 25, 18>}
box {<3, -15, 3>, <5, 25, 18>}

texture {black_and_brown}
}


//floor
union {
box {<-40, -20, -40>, <-1, -15.01, 40>}
box {<1, -20, -40>, <40, -15.01, 40>}
pigment {
gradient z
color_map {
[0 .5 color rgb <.55, .46, .4> color rgb <.55, .46, .4>]
[.5 1 color Black color Black]
}
}
//finish {diffuse .6 reflection .1 ambient 0}
finish {reflection .1 montecarlo { mc_reflect { 1 3 1 100 } }}

}

box {<-.9999, -20, -40>, <.9999, -15.011, 40>
pigment {color Black}
//finish {diffuse .6 reflection .1 ambient 0}
finish {reflection .1 montecarlo { mc_reflect { 1 3 1 100 } }}
}


//4 walls (and trim)

#declare New_wood =
texture {
pigment {
wood
turbulence .3
color_map {
[0 .3 color rgb <.8, .5, .3> color rgb <.8, .5, .3>]
[.5 .8 color rgb <1, .7, .5> color rgb <1, .7, .5>]
}
scale .2
}
//finish {phong .3 phong_size 34 ambient 0 diffuse .8}
}

#declare bright =
texture {
pigment {color White}
//finish {ambient 0 diffuse .8}
}

#declare dull =
texture {
pigment {color White}
//finish {ambient 0 diffuse .5}
}

union {
box {<40, -15, -40>, <42, 35, 0>
texture {
gradient y
texture_map {
[0 bright]
[.79 bright]
[.8 dull]
[.99 dull]
[1 bright]
}
scale .9
}
}
box {<39.5, -15, -41>, <42, -11, 0>
texture {New_wood rotate 40}
}

box {<-42, -15, -40>, <-40, 35, 40>}

//tilted wall
box {<-40, -8, 0>, <0, 22, 2>
rotate 45*y
translate <40, 0, 0>
}
box {<-40, -15, -.5>, <0, -11, 10>
texture {New_wood rotate 40}
rotate 45*y
translate <40, 0, 0>
}

difference {
box {<42, -15, 40>, <-42, 22, 42>}
box {<-10, -11.99, 30>, <10, 28, 50>}
}
box {<42, -15, 39.5>, <-42, -11, 50>
texture {New_wood}
}

box {<42, -15, -42>, <-42, 35, -40>}

pigment {color White}
//finish {diffuse .8 ambient 0}
}

//4 columns

#declare column = union {

cylinder {<0, -10, 0>, <0, 28.5, 0>, 1.25
pigment {color White}
//finish {diffuse .9 ambient 0}
}

box {<-1, 28, -.5>, <1, 31, .5>
pigment {color White}
//finish {diffuse .9 ambient 0}
}

cylinder {<0, -15, 0>, <0, -10.1, 0>, 1.25
pigment {
gradient y
color_map {
[0 .5 color rgb <.65, .54, .48> color rgb <.65, .54, .48>]
[.5 1 color Black color Black]
}
}
//finish {diffuse .8}
}
translate -15.75*z
rotate 45*y
}



object {column rotate 90*y}
object {column rotate 180*y}
object {column rotate 270*y}
object {column rotate 360*y}

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