Thanks for all your comments
The Planar looks like a decent pj, just a pity it's nowhere to be found! This again gives the impression that DLP hasn't moved on much in the last few years apart from now having a dynamic iris. My IN78 has a darkchip3 and the IN76 has a darkchip2 which in itself might make quite a difference. Wonder how the darkchip3/720p compares to darkchip3/1080p. Is it essentially the same chip or completely different in terms of black levels, contrast etc?
Jason, that's exactly what I was thinking with 77". I'm sitting about 90-95" from the screen.