No doubt it's better. It's just not 40% better. Moving from a GTX 750 TI to a R9 280 isn't going to take you from 60fps to 100fps with no other changes to the system, of course, depending on resolution and game settings. Nothing wrong with what you outlined. I think he'd be better off with his build, my psu and your card, but of course that's cranking up the cost a bit too. And having no included aftermarket cooler right now is ok, at least there is the option to do so later. Either way, it's fine so long as if he wants intensive gaming he goes with a bigger card, or if he's ok with lower settings he uses the card he outlined.