I am leaning now towards getting the M60s but I will still need a sub. But now I can't afford quite as nice a subwoofer. I assume refurbished subs will do ok? Where is a good place to find them?

hi TNTguy,
it would be worthwhile to check here:
Axiom Factory Outlet
I believe both SVS Subwoofers and HSU Subwoofers have factory outlet subs available. You can save some going that way. Also might be worthwhile to check out the used market at either Audiogon or Canuck Audio Mart.