what kinda PSU should I get?

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I'm currently gathering parts for a computer, these are the specs: CPU: Intel Core i7 920 2.66 GHz 8 GB RAM (2x 4 GB) GPU: XFX RADEON 5850 (500+W needed) SCREEN: SAMSUNG SYNCMASTER 2243SN (45W to maintain display) MOTHERBOARD: ASUS P6T DELUXE Too bored to list other stuff but yeah I want some expert's advice on how many Watts the PSU should pack...will a 650 THERMALTAKE TOUGHPOWER be enough? I'm just about to finish it. That's the only problem I have left so any advice will be appreciated.