The difference in graphics cards these days of the same type is minimal. The PCB is usually exactly the same, the only difference between cards being the heatsink (some companies leave it factory standard, others add their own aftermarket designs) and/or the clock frequencies/memory.
I generally always buy the cheapest no name card on offer, it makes no difference. Ive never seen the point in having good customer service from a graphics card manufacturer, Ive always just RMA'd any defective/dying cards straight back to my favorite retailer (OcUK).
No need to worry about drivers, as I said, the cards are all pretty much exactly the same (different heatsinks and stickers have no effect on compatibility
)