For 1500 you could build yourself an entirely new computer that would be significantly better than whatever you could upgrade that to.
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CPU- Pentium EE 840 @ 3.2Ghz (Intel mobo, no OC)
RAM- 2Gb Dell brand, 533Mhz
GPU- HIS 4850 Ice Q4
PSU- 460w Dell XPS
Case- Tacky Dell XPS gen 5
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