AMD doesn't have any single-GPU cards that match the Geforce 980. Closest you'll get is the 290X. The 295X2 is a dual-GPU that's similar in performance to the 980 though.
The 290X is a LOT more power-hungry than the 980 though, and puts out much more heat. The 295X2, even more so. So watch out for that.
"Never argue with stupid people. They will drag you down to their level and then beat you with experience."