I hope I am the first to say that you can't go wrong with a H/K 7300 or an EP500 sub. The 7300 can be bought
here refurbed for a very nice price.
You don't list a receiver model, but it may not have enough juice for even the very efficient M60s. The 60's have a very neutral sound and will sound great from low to high volume.
My son has a "Sony dream machine" and I think it has just enough power for the cubes. It works great for his room.
Look for features you like in a receiver. There are plenty of models in the $500 plus range that will drive the 60s.
There may be some UFW-10 users on this forum. There are a lot of EP500 and 600 reviews. The UFW-12 twins are on sale right now. I think Craigsub has a pair. At that price, you should look at the EP600 as well. All of these are great sub choices.
