http://pcpartpicker.com/p/c9pYYJ]PCPartPicker 860k all the way for budget gaming. g3258 is more meant for web browsing and text documents not gaming. The 5350 is meant for home server.
I would definitely reccomend the i3 you picked out over a pentium or an 860k.
I'm honestly surprised at people reccomending the 860k, both the 860k and g3258 friggen suck at gaming compared to an i3, and that's going to be noticeable on 750Ti let alone a 270x.