what do you think/what would you change?
Looks like a nice build. I would probably replace the PSU with this one though: http://pcpartpicker.com/part/seasonic-power-supply-ssr750rm
It's cheaper - and I know SeaSonic is known for good quality PSUs. The Rosewill one on your list in manufactured by SuperFlower, and I'm not sure of the quality of these (as in I really don't know).
One little ote - you're saying complete PC and include a keyboard but no mouse - is that on purpose? :-)
this and ditch the 840 evo, fact is you aren't overclocking, so you don't need a custom cooler.
The fact that he's getting a Define R4 lead me to believe that he might be interested in low noise - and in that case, the 212 Evo might be a good idea.
Not that the stock cooler is particularly loud, but still :-)
I would get a i5 4690k with that build. Absolutely no point in getting a CPU cooler and a locked processor