So I'm running a GTX 980 in my current rig and I'm about to drop some more money into it. So far I'm replacing the PSU and switching cases, and I was wondering if SLI with such high end graphics cards would be worth it. I know 980s are "good enough by themselves" but I'm really just trying to go overkill with this thing.
Should I
A: Just keep the single 980
B: Wait for the 1080
C: Go SLI with two 980s
?