Which card? (PLS)

[XGamer360]

Alrighty, TOMORROW I will be purchasing one of these three card

ATI Radeon Gigabyte X800XL:
http://www.newegg.com/Product/Product.asp?Item=N82E16814125174

nVidia GeForce Gigabyte 6800GT:
http://www.newegg.com/Product/Product.asp?Item=N82E16814125185

nVidia GeForce Gigabyte Dual 6600:
http://www.newegg.com/Product/Product.asp?Item=N82E16814125203



My comp is as followed right now:
AMD Athlon Xp 64 3200+
Windows XP SP2
1GHZ RAM
GeForce Gigabyte 6600
nForce 4 motherboard
Nice vented case


Which card would be the best buy? Which one would I definatly notice a different with? I currently own the 6600. Thanks guys.

P.S. How good is this card? Is it REALLY worth the money..?..

http://www.newegg.com/Product/Product.asp?Item=N82E16814125195

Thanks again.

 

[junglist_soldier]

take it u meant 6800gt on the second link. if so id go with that 1

 

[XGamer360]

take it u meant 6800gt on the second link. if so id go with that 1

Yes, lol. My mistake, sorry.