Well I use a BFG 6600GT OC, it's AGP grant you but they offer a PCI-E version as well. The card comes overclocked straight out of the box. The beauty of it is that BFG offers a lifetime warrenty on their cards, I have yet to test out their support as I've never had a problem with mine, but everything I've heard and read points to their 24/7 support being exceptional.
James