An i7 can be overkill if all you're doing is gaming. Games don't take full advantage of an i7. I'd go i5 if I was just concerned about gaming. Personally I'd go with an i7 if I had the money, because I do more than just game. I don't currently have the money, and the A10-6800K that I have, paired with a Radeon HD 7770 is gaming adequately for me.
The motherboard you list can handle up to the A10-6800K. That's the most powerful processor you can upgrade to. Whether or not it is worth the upgrade from your current CPU/APU depends on what you currently have.