My suggestion is to look at something like this:
http://www.abmx.com/1u-supermicro-amd-opteron-rackmount-server-p-210.html
1U rackmount opteron from Supermicro that can have two dual core
opterons and 4 drives and up to 16 gigs of ram. Supermicro server
motherboards have always treated me well and performed well too.
I've had good experience with similar machines from Tyan :
http://www.tyan.com/products/html/gt24b2891.html
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