I am in your shoes Jamiegisi (except for the B&K that is). I am leaning a little more towards 2-channel, so I am going with the JM Labs cobalts. I watched a couple movies with the dealer on a Saturday (Boy, it sure is nice to find a dealer with a whole lot of time on his hands....went on a Saturday and no one but me came in, listened to music and watched movies all day!) I was really surprised with how well the JM's imaged in 5.1! I also heard them through a Denon AVR4800, and it even sounded good...I would imagine your B&K would sound quite a bit better even.
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