I went through the same question before placing my order just before Christmas. I decided on the M60's for a couple of reasons that came from reading a lot of postings.
1) I don't believe I could tell the difference even with a double blind, side by each, turned on your *@#* test.
2) With the saved money, I spent it on the High Gloss Cherry finish.
3) The biggest difference seems to be in a small amount of bass response so my intent is to get an additional sub woofer in 6 months or so to even out the whole room. I think this would overcome the 60/80 difference.
Just some thoughts.
