So with the Amazon sale round the corner, I was hoping to upgrade my GTX 760. My original plan was to buy another and run them in SLi till I realised my motherboard (Z87-HD3) doesn't support Sli, only Crossfire. So I'm left with a couple other options:
Replace my motherboard and buy a second 760 (Possibly sell my original motherboard too)
Go for a single better GPU, probably a 980Ti / 970, or maybe even an R9 390X.