Or, TropiKo, one could just get linux and be done with windows for good.
Sure, gaming on linux still has a long way to go, but now it's really starting to build up momentum.
For OP, the best recommendation I could give would be as someone else mentioned: Balance.
Don't buy superduper graphics if the rest doesn't match up. For instance buying a great CPU and graphics will still be slow if you have shitty ram, a poor mobo and a slow HDD.
I'd rather go for maybe a tad weaker graphics card, shift the budget over at things that are bad and cheap in order to get those items up to a better standard. (PSU, cooling, ram, a decent and future-proof mobo)
Maybe go for a gtx 760, which is -ok- alone, then add another one later when you have the money for it. Then you have two cards for the price of one gtx 780 and are performing better than said card. Waiting with that 2nd gtx 760 will net you a rig costing just as much in the total run, but you'll be able to spend more money on other parts before getting the final build. (If the budget is restricted.)
I may be repeating myself, but I'd rather have a great build and a bit weaker graphics card, knowing that I can add another one when I have the cash to spend and still pay less than for instance a 780, than to have a 780 but having to go through the hassle of redoing my whole build because I chose a shitty CPU or mobo.
I suppose AM3+ is decent, the 28nm FX processors aren't coming to us in 2014, so unless you want to go with the (Intel) 1150 socket then AM3+ is probably better imo (albeit a dying socket). I'm unsure if the new FX processors will use FM2+, but pretty sure it's not AM3+.
The closest alternative performance wise would be the i5 4670k, more expensive but a mobo on that socket will carry on to the new broadwell-CPU's.
The only reason I wrote all of that is because I am in the same situation myself, dunno which of those to get for a brand spanking new build. I hope it's somewhat helpful though.
I have two rough ideas for mATX builds:
http://pcpartpicker.com/p/2mYJ9 - AM3+ based with a 760. (Choose case wisely and you can fit two of them in there eventually)
http://pcpartpicker.com/p/2mYWl - 1150 based with a 760, tried to use roughly the same components. The difference is the gryphon which costs 3 times the mobo on the other build. (Because it's a damned solid mobo compatible with the new broadwell cpu's, a worthy investment.) Still not a huge difference in price though. I think you'll get the noctua in there with two cards, but I originally had a smaller case and planned it with a single gpu in mind. (r9 290(maybe X))