Old topic!
And what did you end up with? And are you happy with your choice?
I have 3.7i's in a 11.15x17ft wit a sloped ceiling from 7.12 to 10ft and they sound very good allready but I'm going to try and make that 10ft triangle that @mijostyn was talking about. So maybe I won't be playing in the length but in the width of the room.
Best Joost
(Netherlands)