There are too many versions to choose from...
From $1050 to $1500+ but can you really get more FPS on the more expensive ones? is it just like 1%-5% improved performance or there's more to it?
At the basis of it (generally) it's the same GPU chip underneath it, the manufacturers then typically just add on a factory overclock and their own cooling system. The factory overclocked ones will typically perform a bit better out of the box, but not in a noticeable way, and not in a way that the non-overclocked one couldn't also achieve.
Just get one with effective cooling from a reputable brand and you'll be fine. For example what I would probably opt for based on current PCPP prices: PCPartPicker Part List
At the basis of it (generally) it's the same GPU chip underneath it, the manufacturers then typically just add on a factory overclock and their own cooling system. The factory overclocked ones will typically perform a bit better out of the box, but not in a noticeable way, and not in a way that the non-overclocked one couldn't also achieve.
Just get one with effective cooling from a reputable brand and you'll be fine. For example what I would probably opt for based on current PCPP prices: PCPartPicker Part List