He asked if the HD70 would be bright enough to use a Fashion Grey screen. It is - in my opinion - as it's pretty close to the same lumens as my hc3000. But yeah in a light controlled basement a DW screen would be better. Keep in mind that I'm assuming that because he's in a light controlled room does not mean that he wants the lights off all the time. That's similar to me also!
You on the other hand sounded like you were more of a theater guy with lights out viewing.
For your situation as you described I concurred with TritonMan's recommendation. It's going well I hope!
mech