Hmm...looks like Planetside 2 won't require 8-core CPU. Since u didn't play high-demanding game. 965 is enough. No need for a 8-core CPU. Under $150 GPU I would recommend u HD 7850.High-end GTX cards, yes, are in high ground compared with HD 7800/HD 7900 series but a GTX 760 reaches $250. In $150 budget HD 7850 is the best, u could also get GTX 650ti boost by around $150 but it was beaten by 7850.
I saw u have some worries on the productivity of the CPU. Only if u play high-demanding games in high settings do u need i5 or FX-8320 CPU. And for only everyday usage such as surfing the web and word processing, even Athlon X4 640 could handle it without problem in at least the next 5 years, so as the newer programs. "Planetside 2, minecraft and simple flash games" are very light and don't even require HD 7850 and x4 965 (HD 7750 would deal with them easily). The most important thing for u is: do u really prepare to play large games such as GTA5, BF4(both will come soon),Crysis 3, Far Cry 3, BF3 and so on? 'cause I don't want u to regret on your build just solely based on my suggestion. Any more details u could provide could help guys who would like to help JUDGE.