Definetly go with an APU based build. The A10-5800k in crossfire with that 6670 with provide some badass power, but if you do with the APU build I recommend upgrading that RAM to 1866Mhz to make the most out of the APU.
True but at the end of the day if your buying new compenants you might aswell leave the door open for any future changes. Just because right now he only play low demanding games it doesnt mean he wont change up in the future + a build that has options to upgrade keeps its value for longer, if he wants to resell this PC at a later date its better to keep its window of usefulness open rather than a machine that can only play low demanding games from now.
Namix, I think you're right, I mena he won't be able to fully take advantage of the hardware now, but it'll open up mroe options so he can play all the games, thanks!
Regardless SSD's are not important for gaming and if you want to game and dont care about windows start up times witch really is all for bragging rights then you dont need a ssd and if you can get a better overall performing machine without a ssd then its better to go that route