Well my front will definately be timbre matched. I plan on getting a CSi3 to match the RTi8s. I've listened to both the Athena and the Polks, and I can't really tell much of a difference between the two. Mind you this was in a Future Shop store. With the B1, it just seems like you get a lot more for the buck. Now, I can always get the R15s for cheaper, but it didn't seem to be in the same 'class' as the B1 or RTi4 when I listened to them.
My setup is predominantly for watching tv and movies, with occasional music listening.