So here is my machine I just ordered:

Dell Studio XPS

Intel i7 920
12GB DDR3 RAM
ATI 4850 graphics
750GB HDD (7200rpm)
500GB eSATA drive (7200rpm)

Can I handle any HD format with these specs? (HDV, DVCPROHD, XDCAM, AVCHD, AVCIntra, etc...) I couldn't afford the HP workstations or the higher end Dell machines, but these specs seemed to be good enough... Am I in good shape?