[App_rpt-users] System ideas for a first install

A while back, I asked for tips with virtualization. However, since it's my first time, I'd like to use a dedicated box for app_rpt. I'm interested in a system solution that's fairly low profile, but most importantly, that's low in power consumption and heat generaton (which rules out the spare Pentium 4 space heater I have sitting around). I've read that some have repurposed thin clients for app_rpt, with different levels of success. Anyone have any suggestions for systems that have enough horsepower to run up to four nodes on a single box, and around say $100 or less? I'm using URIx's and USB sound fobs. Thanks, can't wait to get going with app_rpt. Jonathan