The best center channel I've ever used was nothing! Seriously, I had a HT with four Adcom GFP-555 amps (two bridged to mono for the fronts), Definitive Tech. BP-20 and BP-10 full range towers all around, and a Lexicon processor.
I sold it all and bought a pair of Dunlavy SC-IV's and a Krell pre-amp and amp. No one would believe that I didn't have a center channel hidden somewhere, and they would get up and look around behind the TV for it.
I came to the conclusion that a HT in a normal household is purchased in bits and pieces. A lot of times because of the cost.
Think about something for a minute. If you could put the same amount of money that you end up spending for the speakers and amps for one high quality amp and pair of speakers, wouldn't you come out ahead having a great stereo that doubles as a HT?
With the imaging, you wouldn't need to worry about a 'good' center channel, or whether the speaker blends with the front mains.
I spent a lot on the HT, lost a lot on selling it, but the sound of the Krell and Dunlavy's makes me forget about it. This is just a thought, and my own personal experience. I'm not trying to discourage HT.