I would stick with NVS. For trading in 2-D you want a quiet box. Next box is going to have passive Xeon chips, passive vid card, passive chipsets. I even decided to drop the plans for SCSI 15k for a quieter 10k raptor from WD. wailing for the new intel chips of 45nm, new chipsets for the chip, new PCIE 2.0, and maybe FB (fully buffered) DDR3 memory.
Next 6 or 9 months should see some new stuff to came out. Works out good enough to wait for Vista to come out with first service pack before i upgrade.
PS, nice BIG box with a couple QUIET 120 low spinners for case fans, those smaller 80 sized fans need to spin to fast ... QUIET is for me. speed yes, also. New 45nm chips will be faster than Woodcrest chips now.