welcome to the foray termdj,
first off, we can have more response and informative postings if we have the mods place this in the projector section.
second, consider how bright (lumens) your sanyo can output, and how it would be on a normal screen size. the rule isnt always the 'bigger the better', in relations to projector screen size. you either loose out on contrast, or detail, depending on how far or how bright you're letting it run.
most of the times, the suggested viewing size would be at 92' or even up to 120 to be honest.
in regards to a wall painted to become your 'screen' so to speak, there are a number of paints out there that can handle it, and give you a better gain of around 1.3 onwards. depends on what kind of 'screen' you want, grey or white.
just a thought.
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