The current motherboard was cheap and has always given me problems. The only hardware that I am keeping with the old system is the case and 600W PS. I already have most the other parts and am planning a complete rebuild with Windows 7 ultimate 64bit.
Final setup will (hopefully) be:
Intel DP45SG Motherboard
Corsair PC10600 1333MHz 4GB DDR3
Intel QuadCore Q6600 2.4Ghz
HIS EVGA e-GeForce 8800 GTS 320MB (hand-me-down, considering upgrading)
2 x Seagate 500GB 7200rpm HDs (planning on running Raid0)
Windows 7 ultimate 64bit