Hi,
I have a pair of M60s as fronts and am actually getting a 635 delivered hopefully by the end of the week. I'll be glad to share my thoughts after I try it out. If you're looking for good prices on it, there were two on-line companies selling it for about $620 w/ shipping included. Harman also has an ebay store (harmanaudio) that sells them refurbed, but latley they've been going around $610-$620 + $35 shipping, so it's actually cheaper for a new one.
You can't go wrong with either HK or Onkyo.
