600W only? i think you sholud put at least 750W or 850W
i5 4670k i reccomend you if you play games, other thinks like graphic desing is better i7 but for gaming is very good
I recommed you too Overclock i5
If you are going to use this pc for years, i think you should put 16 GB Ram at 1800 Mhz
Personally i prefer GTX 770 because i trust more in Nvidia
In general is a good pc gaming but i`m nearly sure that it doesnt work with 600W. If you add 16GB Ram this pc can be usable lot of time
(This is my personal opinion dont judge me)