Sapphire doesn't make Nvidia cards.eVGA doesn't make ATi cards.
To add, XFX doesn't make nVidia cards anymore, and you missed PNY.
Asus Nvidai is by so far the most strongest vga manufacturer with nvidias CUDA gpu chip. maximum performances. and at least 10% more performance than evga
I am a fanboy of performance... since the 5970 was released, i was a HUGE ATI fan, i even had two of them in my Area 51ALX..but now, the 580 definitely has best performance.. So my vote goes to nvidia.. and, i love EVGA coz their warranty is fabulous... and they are the only company that has authorized dealers in SL..