How much is the the 600w? If your going with a PSU that large the Thermaltake 680W is a great value price/Watt. Its an extremely stable PSU and runs quite and much cooler than any other I have owned.
If I would have shot you when I had the chance, I would be out by now
Intel P4 550(3.4)@<font color=green>5Ghz</font color=green>