I've had Gigabyte stuff lately, 560 and then 780. I think it was Leadtek before that, a 7600.
What brands are well respected?
It depends on who you ask. I'm sure anyone had a bad experience with the best brands around. As for myself I've owned Zotac, MSI, ASUS, and Gigabyte Nvidia cards and I never had any issues except when my Zotac 470 overheated.
I really love MSI's Twin Frozr cooling, it's very quiet and efficient.
If I had to buy a 970 I'd go for MSI.