As a general rule, stuff that spins (drives and fans) requires 12 VDC. Everything else requires 3.3 or 5. Since drives also have electronics on board, they draw from both 12 and 5 VDC lines.
Most power supplies have plenty of juice on the 12 VDC line for fans since fans tend to require less than 12 watts each. Where you tend to get bit is the combined 3.3+5 volt area.
As a point of reference, I ran an ASUS A7M266-D using (2) MP1800+ processors and a front side bus of 140 MHz using an Antec PP352 PSU. The second processor and low end vid card combine to draw at least as much juice as your single CPU and high end GPU. I had no problems. I've since moved that setup into an Antec PP880 case (with TP 430 watt PSU) and popped an ATI AIW 8500 video card into it. It's also got (2) Barracudas, a DVD, and CDRW drive.
You would be fine with any quality PSU rated for at least 200 watts on the 3.3+5 and 400 watts overall.
With the Antec TP PSUs, you probably already know that they use thermally controlled fans (read: they run hot). They also include specific molex connectors to thermally control your case fans, if you wish. They are setup to maintain a system temperature on the order of 35°C, which tends to fall to the high side of what enthusiasts feel comfortable seeing. I don't mind as my system is rock solid stable. If you don't like that, you can always hook the fans up to the regular molex connectors. The other thing you should know is that motherboards generally report voltages below spec for the TP PSUs. This is because the PSU regulates the voltage at the connector while many boards measure it farther down the chain (after some loads drop the voltage).
In the end, it's up to you. You would do fine with most PSUs rated over 400 watts. I personally use nothing but Antec PSUs and their 430 watts TP one is well under $100.
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