I have a pair of Boston Acoustics T1000 speakers (from the late 80s, I think) that were semi-recently re-foamed. They still sound very good. I recently added a Klipsch RW-12d subwoofer after finding a great deal. They are connected to a Yahama A700 (another great deal) and I'm quite happy with the set (after I got it balanced.)
I had an old Boston center channel, but it just never sounded all that great. (I think it was just too low-end.) Anyway, I want to get a new center channel speaker. I'd ordinarily get BAs, but mine are old enough that their current line may be sufficiently different that considering other brands may be warranted.
For surrounds, I'm thinking of getting some Polk FXi A6 or LSiF/X since room constraints dictate a rear speaker placement. (I haven't found many bi/di-polar speakers) So, I've been debating what to do for the centers.
Boston RS 244C ($500)
Polk LSiC ($560)
Polk CSi A4 ($250) (The A6 is too deep)
Polk CS20 ($170 on sale, seems too cheap to be good)
Def Tech ProCenter 2000 ($350)
None of these really stand out, and I am in a wasteland of audio stores so trying them out will be hard. (And a wasteland of restaurants, but I digress.) I think all of these are ported, whereas the BAs aren't.