Which video card should i get to my computer?? check please

Hi guys, i really need help and my english is really really bad soo i'll try my best... Well i just want to upgrade my machine with a better video card!! Here are the specs:

Asus P5VD2-X
Core 2 Duo E6300 1.86ghz
HD Seagate SATAII 250GB
4GB DDR2 Kingston 667
Case Elegance (Lots of extra coolers)
Power Supply Seventeam 550W

So which video card should i get for the configs above?? I just want to play at the resolution 1280x1024 with AA and AF in Windows XP SP3... NVIDIA or ATI

XFX GeForce 9600 GT XXX (512mb/256bits DDR3)
XFX GeForce 8800 GS Alpha Dog XXX (384mb/192bits DDR3)
XFX GeForce 9600 GSO XXX (384mb/192bits DDR3)

All cards above are the same price here... difference 10$ max

Which video card of these above is the best choice for my computer?? or which card should i get for the same price??

And what about my Power Supply will handle any of these cards ok?? Cus i can't change it right now...

I would recommend the ATI HD 4670. Its new and it overpass the 9600 gso and the 8800 gs. I belive that xxx facotr means they are Overclocked so they might be as good as the Ati, perhaps even better i dont really know, but whether how it is, the ATI 4670 is really cheap. If you find a "really" good deal for the 9600gt, i would vote for it, otherwise get the hd 4670. its found in 80-90$.

+1 for the 4670!

Badass card for 80 bones.

Of the 3 you had listed, the 9600GT would be the fastest. The 4670 would be a good choice if it's available and cheaper then the 9600GT. Stock 9600GT uses 61w, stock 4670 uses 58w.

If you're going to overclock , the HD 4670 shows promise. Guru3d got an extra 20% FPS for a 22% memory and 8% core OC. Just bumping the memory speed up (more bandwidth) could give you a lot of speed.

Otherwise, if you find a good deal, the 9600GT is a bit faster than the 4670.