I'm about to move into the 2000's and update all my 20 year old stereo equipment. I have decided on the M60's to start and will also eventually purchase a sub, center, and surrounds to go to 5.1. Those purchases are in the not so distance future (less than a year), but as a teacher coming up to those lean summer months I'll have to do without for awhile. I know that in the house I am in I will never go to 7.1 so that is not a concern of mine. (If I move later, I'll get new stuff later) I do want the second zone functions as I hope to set up a pair of outdoor speakers through the same receiver. My listening will be about 50/50 with music and HT.
I am looking at different receivers and think I have narrowed down the choices to
Onkyo 601 - about $300, sometimes less refurbished
Denon 1803 - about $300 refurbished
Denon 2803 - about $400 refurbished
HK 330 - about $400 refurbished

Any opinions on those given what I am looking for and matching up with the 60's or are there others I should consider.

Also, I am not against purchasing refurbished or used equipment. Is there a good website for people who are selling used equipment besides ebay?