I second the earlier recommendations about auditioning some of the internet brands out there. Some of them have a 30-day return period at no additional cost.
I have a set of Aperion 533-T speakers and like them very much. My only complaint is that they are bass light and have to paired with a subwoofer. But, since you're using a 5.1 setup, you've already got a sub there. I wasn't able to listen to the 633-T speakers because my wife killed that thought right away. Too large. They're noticeably larger than the 533-T.
I would almost compare them as a before and after photo of a teenage boy going through puberty over summer!
Some quick thoughts on my Aperions:
Pros:
Very good sound
Crisp
Able to be pushed
Great piano black finish
Excellent customer service
30 day trial period at no extra cost if not liked
Cons:
Have to order them to get 'em in the house
Bass light - need a sub pairing
extension only goes to around 65 hz
Can seem "bright" when really pushed.
Power hungry (at least for my p.o.s. Sony receiver

)
could be considered "glorified bookshelf" speakers due to range
I really do like these and have been very happy with them. I'm currently only running a 2.1 setup. They won't kill you on the bass, but I love playing classical music,
a lot, and that's my main use for them. I was going between the B&W 603S3 and these. Price was the end determining factor.
My great room has wood flooring and I'm sure that attributes to the perceived "brightness" of the speakers. My wife also won't allow any kind of treatments on the walls. Only the two couches and the area rug.
-pat
ps - there was another thread detailing some complaints on the finish of the 633T. I experienced nothing of the sort with my speakers from Aperion.