How many watts should my power supply have?

Im making my first custom computer, here is some parts that im going to use: Sound card: C44-3400 :: Creative Labs Sound Blaster Audigy SE Video card: XFX GeForce 9800 GTX Motherboard:Asus M4N78 PRO Motherboard - Socket AM2+, Geforce 8300, ATX, HDMI, SATA, Gbit LAN, Hybrid SLI About how much watts should my... show more Im making my first custom computer, here is some parts that im going to use:
Sound card: C44-3400 :: Creative Labs Sound Blaster Audigy SE
Video card: XFX GeForce 9800 GTX
Motherboard:Asus M4N78 PRO Motherboard - Socket AM2+, Geforce 8300, ATX, HDMI, SATA, Gbit LAN, Hybrid SLI

About how much watts should my power supply have?
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