What are the most important specs of a projector?

I'm trying to compare projectors, but there are so many specs I don't know what to compare. Basically all I am interested in is the look of the picture (that is sharp and everything, etc.). Lumens are one thing that's important for this, but what else?

Also, I have a nice white wall. Will that be fine instead of a screen?

Thanks, Brad

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Bradley Burton
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