Advice for a PSU

[Kemble]

Building a computer from old parts for a work station to be a RIP computer purely for sending large files to a wide format printer.

The components are:
Mobo: Abit AW9D-Max
Chip: Intel quad core 3.4 (Big Typhoon cooler)
Video Card: ATI Radeon 4870HD
Memory: 8gb OCZ 8500 Ripjaw (2gb x 4)
HDD: (1) WD SATA 250gb Black Caviar
1 CD-Rom drive

All I need to complete this rig is a PSU. Therefore, my question is: How big & what kind of a power supply do I need to power this? It's been a while since I've bought a power supply and the ones that I have in my wife's and my computer are 800w PC power & cooling and at the time were $200+. I'm not looking to go that big for this little PC I'm building but I want to make sure it has enough juice to power the 1 video card and the PC itself. I'm looking for the least expensive of coarse. Be nice to stay under $50 if at all possible.

newegg or tiger direct links would be the most helpful.

Thanks so much in advance !!

[AMDforME]

PC Power and Cooling and Seasonic are top PSU choices. There are any number of PSU calculators online. You probably can get by with 500-650w from a quality PSU. I'd look at the Seasonic X650 if you want to be a little future-proof. The PCPC Silencer III 600W would also be sufficient,l IMO.

The calculator at the link below works well if you enter accurate info. It also allows you to add a safety margin for capacitor aging, etc.

http://www.extreme.outervision.com/p...ulatorlite.jsp