I'm thinking about 9' away from the front (window) wall. Close to ballpark here, if the TV is 3.5' away, the added 6.5' gives you a 28.8 degree viewing angle (on the cusp of being able to resolve full 1080p, THX being 36 degrees, my preference being bigger yet). I'd try to get to at least 30 degrees. Anyways, at about 9.2' would you hit 38% room length (from the rear in this case) and that's the ideal starting point as far as axial mode issues. It should be able to all work together fine.
Having your speakers that far out, well if your experience mirrors mine, you will get the most out of your PSBs. When I finished a repair project on a T55, I threw them em in the LR, several feet out, and they've never imaged better than in that fleeting situation.
Just curious, is Bryan assuming that you are up near the back wall? If so, I can understan why the Monster traps would go back there, and there may not be a bigger proponent of getting off the back wall than he is, and he'll tell you to treat the heck out of it otherwise.
If looks ARE important, I would get the framed type. As owner of some 242s and 244s (all hidden), the uncovered fabric edges are not true/straight, and don't pass the ultra sexy test, IMO. A great value, but again if looks are important, get the framed type . . . or better yet the art panels.