I want to thank you all for the valuable input.
I had a chance to compare the B&W CM8 vs. MA RX-6 vs. PSB Image T6 and I must admit that B&W are much better sounding speakers. It's a totally different league. The sound clarity is superb. The detail level is amazing. The more I listen to them the more I like them. The only minus is that they can't reproduce very low bass but my sub comes to the rescue.
As for MA RX-6 vs. PSB Image T6: PSB Image T6 sound better to my ears. The sound is fuller and not as harsh as MA's. It's also a true 3-way speaker vs. MA's 2.5-way and you can clearly hear the difference. They are good speakers for their price but just can't compete with CM8's.
I also had a chance to compare a Marantz SR 6007 vs. my current Pioneer VSX-1020-K and I was very surprised (pleasantly surprised) to find out that my Pioneer sounded better than a receiver that cost 3 times more! I tried to play it with or without equalization (still hate the Audyssey), different tone settings, different speakers etc. Pioneer was superior in every aspect! Wow! I didn't expect that, but I'm happy
So I'm staying with my CM8's and my Pioneer for now and will try to upgrade my center channel to B&W CM Centre if I find it for a right price.
Thanks for your advice.