GTX 480 ti or Radeon 6870

Well for starters it's a 550Ti not a 480Ti (no such thing) , the 6870 is a little more expensive but it is the better card than the 550Ti.

MSI N560GTX Twin Frozr II/OC GeForce GTX 560 (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card $199.99 and a $20 rebate

http://www.newegg.com/Product/Product.aspx?Item=N82E16814127593

This card would be better if you add $10 to your budget or if you can wait till Black Friday then you could catch a good sale and get it cheaper or some other card could go on sale and be in you range like this one;


http://www.newegg.com/Product/Product.aspx?Item=N82E16814127593 $209.99 and a $20 rebate right now.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814130664