I'd like to clear up a few things here:
First, you do not necessarily need an expensive (more powerful) CPU like an i5 for gaming. Take a look again at the fps in this link: http://www.ocaholic.ch/modules/smartsection/item.php?itemid=1180&page=9
Notice that nearly all the games ran at well over 60fps regardless of the CPU. Anything over 60fps is basically undetectable to the human eye and when you run higher fps (70+) you'll get screen tearing, which looks nasty. The higher the frame rate, the worse the screen will tear. This doesn't happen on displays with frequencies higher than 60hz, but regardless, such refresh rates look just as smooth at 60fps as it does at 160fps. So does it really matter that the i5 can run one game at almost 200fps and the A10 runs the same game at 100fps? No. Typically most people run 60hz displays and if their GPU has substantial performance, you run with v-sync enabled which limits the frame rate to 60fps (matching the 60hz of the display) and the result is butter-smooth game play with no screen tearing.
Getting back to the benchmarks from the link; you'll notice there were only a few games that really stressed the system and frame rates dropped well below 60fps. Crisis 3 @ 1080p max settings, Far Cry 3 @ 1080p max settings, Sleeping Dog @ 1080p max, and Metro Last Light @ 1080p max settings. In all those instances, notice the frame rates are nearly the same, regardless of CPU. This is because, at those settings, the game is more GPU-limited, not CPU-limited.
Skyrim was a little different than the others. At 1080p max settings, the i5 was able to push 100+fps, while the A10 trailed at just over 60fps. But remember, anything over 60fps is going to look smooth regardless. So the A10 is still able to do everything the i5 can in terms of delivering close to or over 60+fps.
They used an HD7970 GPU in this test which is a fairly high-end card, even still today. The A10 was able to handle it just as well as the i5 in achieving 60fps+ and matching the i5 when the graphics were maxed.
It can be very misleading when you look at benchmarks like this. But when you look at the actual data that matters, the data that translates into what you actually use and experience, both processors deliver the same smooth game play. The A10-6800K does it for $50 less and the 760k does it for $100 less (half the price of an i5).
Take a look at the following video. You'll see that the low and mid-range GPU's are still the main bottleneck of both systems. It's not until he steps up to the high-end GPU that the i5 system is able to significantly out-pace the 750k. But again, notice in most games with the high-end GPU, the FPS is over 60 with BOTH CPUs. That is what's most important. Not which had the highest fps. Crysis 3 is a tough one but even with the cheap 750k, frame rates were more than playable at 40+.
http://www.youtube.com/watch?v=qIT9uLDjZcg
delcolux, if you want to provide us with a list of parts you have and a budget you're willing to spend, we can help come up with a few build suggestions. Just understand that you don't NEED an i5 for great gaming performance.