Okay, I was about to suggest a 4790k but the additional cores of the 5820 will help you a lot. In fact my 4790k only gets beat by 6+core cpu's and with a slight OC I could probably fix that. I'd also suggest looking for builds on PC part picker that use your CPU, cooling solution, GPU and see what their OC temps are, assuming that's something you want to do. It won't give you an exact temperature estimate but it' should be close
Also if you plan on upgrading in the future I'd suggest a different PSU. 650 is enough, but I might suggest a 750-850 PSU. Than leaves you plenty of room to add components