Atm I'm building a new computer system:

Athlon 64 3500+ (S939)
Abit AV8 K8T800 (S939)
GF6800 GT
WD Raptor 74 GB
Seagate Barracuda SATA 7200.7 160GB
1 GB OCZ DDR400 (up to 2 GB in future probably)
DVD drive, floppy, DVD burner possibly in future
Audigy 2 ZS Sound
ISDN adaptor
+ PCI TV card possibly in future
Cooldrive 4 for the Raptor and looks

And perhaps an extra PATA (IDE) drive and a PCI cooling card.

What 'number of watts' PSU do you think I'd need to run this lot stable? I'm currently thinking an Antec Truepower 480 Watt, but I haven't got experience to tell me whether this is enough.