Well EVGA has the step up program, and OC decently
Leadtek has massive coolers as well as massive OCs. Generally speaking they are a little on the noisy side.
MSI: All the pros of leadtek without any of the cons. Price is generally a bit higher than others.
BFG: OC is pretty good, Lifetime Warranty
Gainward: Premium Cards, with handpicked memory and nice OCs. You pay a premium for it.
Gigabyte: Generally buggy, cheap capacitors and electronic equipment, name brand, flashy, performs decently.
XFX: Newer company, generally OCs OK, cheap.
Asus: Strays away from reference, uses custom HSFs, sometimes better rated memory, pay a large premium.
-Kevin