EVGAs are rock solid for the most part.
Sapphires are good, but customer service is so-so and the cards look, ehh.
I loved BFG, but too bad.
XFX had seen better days, some of their recent products seemed to have little problems, but its still above average.
ASUS is decent, little nits here and there but good.
Have no idea about MSI, but their HAWK/Twin Frozr products look great.
Really dont know about gigabyte, but given their record in MoBos, decent.
Not familiar with Galaxy, but I like their logo(lol), but it seems a bit hit and miss.
HIS/Powercolor/Palit/Gainward are the better value brands to me, so go for it if its cheap. (Though Palit/Gainward is trying to move upmarket with the Fermis, lets see about that)
Diamond/Visiontek/Sparkle, cards Id buy if it were on sale.
Zotac is made by Sapphire IIRC, so should be decent.
The rest (Albatron/Apollo/Club 3D/Chaintech/VTX, etc.) is case by case scenarios.