i have the same resolution but i was thinking for the future games but like you sad its not that big deal and the gtx580 more than enough. and i read lot of reviews if i want to put another GTX580 DCII they work great in PCIE 1 & 3 but not good for the air and if u put them in PCIE 1 & 4 they will not work as good as 1 & 3 they will get 1000 less in 3dmark is that right ?
Case: Corsair Obsidian 750D.
CPU: Core i7-7700K.
Board: Asus Maximus IV Formula Z270.
VGA: Asus Strix GTX 1080.
Ram: 32GB Corsair VENGEANCE LED 3000MHz.
CPU Cooler: Corsair H110.
PSU: Corsair AX860iW.
SoundCard: Creative Sound Blaster Recon3D PCIe.