the poweredge 2950 is not made anymore however it is still a powerful machine. the only thing is its a rack mount
http://www.ebay.com/itm/DELL-POWEREDGE-2950-GEN2-2-X-DUAL-CORE-3-0GHZ-4GB-73GB-10K-COMBO-PERC5-DRAC5-/170887823590?pt=COMP_EN_Servers&hash=item27c9b540e6#ht_1476wt_985
then you may want
http://www.ebay.com/itm/370632768976?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649#ht_1572wt_985
it handles whatever i throw at it wile running 4 additional windows installations in hyperv. you can put regular sata drives in it if you want more space.