>> - Size
>> - Contrast ratio
>> - Noise level
>> - Lamp lifetime
>> - Colours saturation
>> - Number and type of inputs
>> - Fancy extras like auto-focus, auto-keystone, USB/LAN control etc.
>> - Can it be used upside down (for ceiling mount)?
>
> Contrast and lamp lifetime [and cost!] seem important. None of the rest 
> seem especially important for what I need.

Noise?  There's nothing worse than trying to listen to somebody or watch 
something and have the horrible loud buzz of a projector in the background.

> What's auto-keystone?

Makes the image look square on the wall/screen, even if the optical axis of 
the projector is not exactly perpendicular to it (good if the projector is 
portable, not much use if it is going to be fixed).

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