Wow u'r going a bit extreme, man. A10-6800K would be more wasteful 'cause its GPU is even better than HD 7660D. For future update u would waste a even-better IGP.
i3 shouldn't be too inferior compared with A10 CPUs. Intel CPUs has better efficiency than AMD CPUs. AMD CPUs are for budget solution but since u have a i3 there is no need to change your CPU unless for intensive gamings. CS:GO is just not so intensive, and a HD 7770 or a GTX 650 ti would solve the graphic problem.