ATI: Newegg.com - SAPPHIRE 100283-3L Radeon HD 5770 1GB 128-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card
nVidia: Newegg.com - ASUS ENGTX460 DirectCU TOP/2DI/768MD5 GeForce GTX 460 (Fermi) 768MB 192-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
All of 1 minute on newegg. There is probably slightly better options.