ACidBaseD
ACid DrinkeR
FX-6300 is capable enough to handle GTX 760 and it will handle 280X also with small bottleneck, not very huge.
But when he wants to upgrade to his next gpu [IN probably 2-3 years time] he will have to buy a new CPU [+mobo] to avoid bottleneck, whereas if he goes for i5 [and a 270X - 15.5k] he can easily upgrade his gpu down the line [with newer technology] without buying new cpu+mobo