Try the same search Fred mentioned to search for posts with M60 and M80... you will find dozens of great comparisons between the two.

My 2 cents, if the M60s are closer to your budget and you don't have a gigantic room, you will be quite happy with them. I've heard both the 60s and the 80s (not side by side) and I found them both to be very very good.

Jason
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Epic 80-800: HG Cherry | HT Pics