Johnny Bravo :
Gaming and I guess rendering too.
You said i5 4570 or i7 4790?
i7 is the best, but probably more than you need. I do rendering and I7 4790 is ideal but OC i5 4690K will also do very well. Rendering is very CPU intensive, if you going to do so, the K versions will be very helpful.
To clarify:
I5 4670K / i5 4690K are essientally the same with 4690K having slightly better thermals
i7 4770K / i7 4790K same logic as i5 above applies.
Non-k processors are NOT overclockable.