Antec 480w TP2 good enough?

[Len]

After reading many posts and some articles on psu requirements, cold someone kindly offer their opinion on the psu I've chosen to do the job. I tried to calculate the wattage requirements and came up with around 450watts, but that's also assuming close to full load on all components. Some of the posts seem to suggest that is an unlikely occurence under "normal" usuage. So I figure the Antec 480w TP2 will be ok, but need some re-assurance before I start my system build.
Thanks in advance.

My intended system build will likely comprise of the following:
PSU - 480w TP2 (came with the case I purchased)
Gigabyte K8NXP - sli
AMD X2 4600
1 x Raptor HD 36gb
1 x Raptor HD 74gb
1 x Seagate HD 7200.8 400gb
2 x GeForce 7800GT extreme
2 x 1GB Corsair TWINX2048 3200C2
1 x Pioneer 110 DVD
1 x 3.5in floppy
1 x 7700CU Zalman cooler

 

[Rugger]

With that setup I don't think that 480W is sufficient. You can try it, but don't be surprised if you run into stability issues.

*Steam rising*
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BUNNY STEW FOR DINNER!!