Originally Posted by shamrock1213
Check out this thread for how others dealt with the projector on a shelf: Upside down adjustable shelf mount?
What kind of light control do you have in your room? About the only reason to go with the h180x over the w1070 is that the h180x is brighter on paper (who knows what it is calibrated). But, I definitely think it is worth the extra $ to go with the w1070 as that gets you a 1080p projector with excellent color. Another choice to consider is the 131xe, which is a little cheeper than the w1070. I own that projector and are generally happy with it, although I'm still tinkering with getting the colors just right.
You may want to consider buying the projector first and then deciding on screen size as you determine placement, etc. But, if not, I would strongly consider going with a screen size that is within the middle (or at least not at the fringes of what the specs say) of the zoom range on the projector you are buying. I say that because, right now you do not have a definite place to mount a screen and the projector. Unless you go with a fixed, wall mounted screen, your drop down screen will be a few inches away from your back wall. Your projector lens will also be at least a foot from your back wall, possibly more depending on where the vents are as you want to give it adequate room. By not buying a screen that is designed for the fringes of your estimated setup, you have some wiggle room on placement. That actually is another reason to go with the w1070 as it has a built in lens-shift, not a ton (don't know exactly how many inches you can offset your screen from where you are projecting from in your setup), but better than none, which gives you a bit more placement flexibility.
Also, a quick word on 720p and 1080p in projectors. My first projector was a 720p model, with a not so great contrast ratio. Coming from a 40" 1080p LCD, I was a bit disappointed with the resolution of the 720p projector.
At the time, I was using a hdmi splitter so I could either watch my projector or my TV without having to change wires, etc so I could easily compare. I remember watching Monsters Inc, where either the BD menu or the opening credits have a bunch of very small illustrations of doors. On the 720p projector, I had no clue that they were doors until I happened to turn on my TV for something. Again, that is probably the most extreme example because the fine details were needed to discern what was what.
With that said, I think you will be happy with whatever you buy, so long as it has a decent contrast ratio (which all the ones you mentioned do). I think you will get a longer life out of the 1080p one as it might hold off the upgrade fever a bit longer, but the 720p one will serve you well.
Oh, one last comment, the h180x, keep in mind is a WXGA projector and not a 720p projector. That means the aspect ratio is actually 16:10, rather than 16:9 like 720p and 1080p are. All this means is that you will have black bars at the top and bottom of your image. If the h180x is like my 131xe (check the manual before you buy), there is a built-in software image shift. All this does is shift the projected image up or down on the screen. It is non-destructive unlike the keystone adjustments as it simply is a pixel by pixel shift. What this means for you is that if you do go with the h180x, you will have a little wiggle room as well, as you can move the projected image higher or lower. It also means that unless you go with a 16:10 screen, your projector will overshoot the screen slightly, so you may want to look for one with a larger matting on the top and bottom. Even though it will be projecting "black", black is never completely black.