Brand is a non issue here. 3 general rules for picking up the GPU brand:
1.Which ever is the cheapest, go for it.
2.If all are of same price, look if any is coming with a factory overclock (however small overclock). Get the one with overclocked speed as factory overclock is covered within warranty.
3.All priced same, clock same-look for any free game coupons/bundles and go for the one carrying any.