ohp distance vs. projected image size

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I'm dedicating / planning a room for my DIY projector / Home Theatre project and would like a bit of assistance re: the distance from projector to screen and it's related image size.

According to 3M's web site, the 9550 which I've picked out (I might get a 9700, depends on supply) should be at approx 10.9 ft in order to fill a 96x96 screen -- however, I'm assuming the LCD panel (I've got an nView Spectra C on it's way) maskes off some of the stage, obviously meaning that the projected image won't be 96" sq -- can anyone elaborate or provide an example from which I can (roughly) calculate a comparison, ie, can soemone say "I have a similar setup, and my spectra projects 96" at 14 ft etc?

Ideally I would like to place it between 13.5 and 15 feet (I assume it's measured from the top of the OHP to the screen?)...

so far my setup for those who might be curious:

DVD player + Digital Cable + VCR (all via S-Video) --> Rotel AV Reciever --> S-Video --> line doubler (thinking the AVT-3343 so I could bypass the reciever and run component to it http://www.avtoolbox.com/avt-3343.htm or just simple s-video using a TV-3000 http://www.avtoolbox.com/tv-3000.htm or i've even considered a ATV-3700 so I can run both component from my dvd player and s-video from my reciever http://www.avtoolbox.com/avt-3700.htm but am open to suggestions) --> nView Spectra C

I hear the Spectra C is a good solid panel, but is a bit "beginnerish" -- I'm open to suggestions for a higher-end panel, preferably one that will do 1024x768 @16.7 (w/ a 150:1 or better, and fast response) -- am I dreaming, or can such a thing be had for under $500, such as the Sharp 2500 unit?

Oh, also I could use some suggestions on screen gain, I realize the higher #s mean you need less lumens, but at what cost besides viewing angle -- the only post i saw suggested 1.5 - but is this a blanket statement or is it dependant on your OHP lumens (the 9550/9700 is 4k)? Does that mean more smear, or bluring, or what? I don't mind spending a good bit on a decent screen, I'm a filmmaker / film student, so this is money well invested in my opinion, esp. since it gives me an accurate way to preview my work in a projected vs. CRT environment...

Budget isn't so much an issue, I figure, as long as I spend less than $1500 (ie, the price of a cheap LCD portable) I'll be very happy.


PS - that checkbox/popup saying i must search is ANNOYING AND DUMB. I have spent several days researching this, esp. on these forums, and just because I hadn't yet registered doesn't make me a fool... :(
My setup uses the 3M 9700 OHP with a Sharp QA-1650. The panel does cover up some of the light, and when you try to fill the whole screen (I have a 70x70 Da-Lite adjustable screen) with the LCD image, the image gets blurry. My suggestion is to go for the 3M 9750 or get the zoom lens for the 9700. The magnifyer attaches to the 9700 and allows the LCD panel to be magnified more so that you can fill a whole screen. I don't have it yet, but I've seen it go for $30. Anyways, with my Sharp QA-1650, I get a screen-door effect. Do all the LCD display panels have this or is it just mine? Anyway around it?
I'm no expert on A/V, but I think a line doubler will help. I have a TV-3000 and my nView Z panel looks great. It is less than 12' from the screen and I get a projection area of approx 96" diagonal. The screen door effect is much less than it was with my old nView Spectra C which didn't have the TV3000 connected. Most times, I don't even notice it and nobody else has. My OHP is an Elmo A305 Solar Deluxe which has 7300 lumens.

Here is a link that describes how a line doubler works.

BTW, the TV3000 is $99 and can be purchased at www.avtoolbox.com
I'll check out the line doubler after I get a car. No one I've shown my setup to has noticed the screen-door either, not unless I pointed it out to them.

Oh, in my previous post, I forgot to mention that the 9700/9750 is capable of 4300 lumens in bright mode, the standard mode is like 3500 lumens or something. I don't notice any difference between either, so I leave it on 3500 to get the extra lamp life. Personally, I'd go for the 4000 lumens setup, I think those metal halide lamps cost like 5 times as much as a regular OHP bulb, but if cost isn't an issue, go for the best.

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