You will naturally want to get the best gaming CPU that you can afford, but don't spend so much money on it that you have to go too cheap on the other components. Very often, once you reach a certain standard of processor, you don't gain a lot more by going up rsair one pro i200 to the next level, so just get a CPU that will meet your requirements, and then you can save your money to buy other high quality components.

The main two manufacturers to consider are the two that currently dominate the market; AMD and Intel. Both of them produce very high quality and extremely reliable gaming CPUs, so the best way to choose between them is on a case-by-case basis, rather than having a preference one or the other of the manufacturers. In other words, make the comparison of different gaming CPUs based on the relative specifications of each one, rather than the brand name.