Video Card Manufacturer Tier List

I was bored one day and wanted to create a tier list of graphics cards manufacturers. I don't have experience with that many video cards (I buy used more often). So I'm not too sure on this list, any advice would be great. Thanks!

ATI Video Cards
A Tier

• XFX
• HIS Hightech
• Asus

B Tier

• Sapphire
• Powercolor
• Gigabyte
• Diamond
• MSI
• Visiontek

C Tier

• Biostar
• Jaton

Nvidia Video Cards
A Tier

• BFG
• EVGA
• XFX
• Asus

B Tier

• Gigabyte
• Palit
• Leadtek
• Sparkle
• MSI
• Zotac

C Tier

• ECS
• PNY
• Biostar
• Jaton