Quote: "In the US you can get an 8 core Fx-9590 for under 250 usd. That would blow anything out of the water at that price point for intel."
Quote: "So your suggestion is to spend 4-500 usd on an intel cpu"
Not entirely sure where you're getting your prices at. I can get the 4GHz i7-4790K for $280 at my local store, which will outperform the 9590.
Intel uses significantly less power than AMD. If power usage isn't a concern, and you're looking for maximum overclock potential, then AMD might be the right choice.
AMD has a lot of great CPUs, as does Intel. But if you want the verdict on who has the best of the best, it's Intel. But not everyone needs the absolute best, and that's where your preference and needs comes into play.
Quote: " It's frustrating to see only a couple of cores used when I'm playing a game, but so far all new games are very playable with my GTX 760"
The gfx card is going to make a bigger difference in gaming than a CPU ever will.
My personal opinion? Get the FX 8350 for price and lower power consumption (less heat if that's a concern). But in all honesty, I think you'd be wasting your money on a CPU upgrade. My question is, why do you want to upgrade it? It won't help with gaming. And your 6100 will handle your normal every day to day tasks already.

"I like offending people, because I think people who get offended should be offended." - Linus Torvalds