ohh by the way im thinking VIsta Ultimate 64bit
8MB RAM
Core2Quad Q6700 8MB 4x2,67GHz
and what about GeForce 9800GX2 1GB (Corsair 550W PSU) PCI-E Grafikkort (GeForce 9)(dont know if it supports 2 monitors)
Corsair 550W PSU, Scythe CPUCooler