For gaming, pick a suitable component that is NOT bottlenecking each other.
For example, getting an I3 for GTX 980 maybe not suitable, cause the CPU will bottleneck the GPU.
For Intel or AMD mattter, it`s just based on your preferences, cause CPU are not based on drivers like GPU.
For a same priced CPU, it`s an important matter that you need to know that most games nowadays require at least 4 core for optimum performance.
8 core AMD cpu are better in multithread using task/programs, while it tends to produce more heat and consume more electricity.
For Intel, I5-4690K is still the best gaming CPU for my cause.
For AMD, getting an FX-8350 or A10-7870K is great.
For GPU, do NOT rely on the written specs, instead go watch the actual benchmark and result.