XFX Radeon HD 4870 XXX 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Low Profile Video Card: http://www.newegg.com/Product/Product.aspx?Item=N82E16814150339
for $274.99
or
EVGA GeForce GTX 280 1GB 512-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130365 for $304.99
for $274.99
or
EVGA GeForce GTX 280 1GB 512-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130365 for $304.99