Can anyone recommened a center channel speaker that would work well with my current setup? I am powering 4 Speakercraft AIM8 three in-ceiling speakers and a MartinLogan Dynamo subwoofer with a Denon 3808. The rep at Magnolia recommended Monitor Audio R225 as a nice compliment to my system. Are there any better options out there (around or under $500) than the MA R225?