Hello, i have to built a gaming cpu for my friend,and i m assembling it myself, so far, he has decided to go with Asus R9 390 Direct CU III and i5 6600k. My first question would be, should i get the 6600 instead of the k version as overclocking isn't a priority, to save a few bucks? Second would be, suggest me a good MOBO, and third, what would a good PSU, if i go with any MOBO with the DDR4 ram?