[GTALUG] Looking for a used 1U server

Hello everyone, I'm looking for a used 1U server, mostly to use as a virtualization host, so the general requirements are -- SATA, lots of ram slots available and the support of relatively cheap RAM, lots of cores. I've been looking really hard at HP Proliant DL160 G6 and HP Proliant DL165 G7, budget -- around $500. Also, are there any local computer recyclers that would have 3-5 year old off-lease systems? Thanks, Alex.