I bought a ASUS one last week (ENGTX460CU), good stuff but be sure your Mobo and power can handle it (have a look over internet), I changed my mobo to run PCIe 2.0 (PCIe 16x is enough but you'll waste some of the VGA capacity)
about power it needs 2 6 pins connectors and its recomended to have a 450W minimum system power (what is written on the box)
ask me if you need more details about it
