go with a 970 I mainly will be playing WoW on a 1080p monitor and figured with the 980 it would be kinda overkill even on ultra settings since WoW is more CPU dependent. But looking around on eBay a lot of people are selling their 980's for the price of a 970 because they bought a 980ti so if I can get a used 980 for $300-$350 I'll jump on it.
Oh, that. Well, it will be overkill and mainly it probably did not give you even any additional framerates - but maybe I'm wrong.
I have a micro case so not really OCing the GPU is more do to cooling issue since no room for water cooling.
Oh, that. Microcases suxx
You did not have room for serious case, like the Phanteks Enthoo Pro? It is a great case and your cooling problems will be fixed very quickly. Also it let you run your fans at low speed, so quietly. No noise!
If I was you, I would rather update your case and enjoy WoW in quiet room. GTX 970 for 1080p monitor and WoW is more that adequate.