Today I got my Optoma GT750, too. It's my first projector and I'm completly clueless about black level or contrasts but for me the picture is very bright and it has very nice colors.
HD-Ready is enough - while watching movies I don't have any problems with missing details or something like that. And the 3D is awesome! The effects are great and - for me - it's bright enough (with Optoma FR glasses).
Unfortunately I notice the rbe, but only at white letters on dark backgrounds. But it's less annoying as I thought.
I think, that the Optoma GT750 is a nice and cheap gaming or movie projector with a great 3D mode
At last some pics (not reworked just comprimied).