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A rule of thumb I've found is that HDs take 25W, as do CD/DVD drives. Motherboards average 100W, and the video card depends on the model. For overkill lets just say 50W for the 9800 Pro, since it requires it's own power connector. 80mm fans also average around 5W, but can vary on the brand and speed.
So based on what you said:
100+3*25+50+4*5+2*25 = 295W
Now we add 50W just as a precaution and you get 345W
Now this isn't counting any additional cards you might have, and overclocking pulls more power than normal. This is also a very general rule, it can vary alot between brands and models. The main thing is what people have said already, watch the brand of PSU you get and you should be fine. Bottom line is a 400W PSU will be fine.
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"Empirically observed covariation is a necessary but not sufficient condition for causality" - Edward Tufte
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