That PSU will be enough. HOwever i have one question about your system.
Why are you getting a harddrive that supports NCQ and SATAII when the only boards that support 1 of those features are the Intel boards. I would go with a Seagate Barracuda 200gb and a WD Raptor or something similiar to that. That HDD you have now is a waste as you M/B doesn't support half the features.
Please dont take this as an insult... im just trying to help
-Kevin