Welcome! This looks pretty decent to me, although I would recommend a few changes here and there.
1) RAM. I have never even heard of Mushkin (EDIT: So I looked on Newegg and realized I have seen some of their stuff, but in the past 6 months or so, I have never seen anyone use them in their build, which may be telling. Up to you.), which is a bad sign. For RAM, since there isn't much of a price difference, always go with the more popular/trusted brands. Chances are nothing will go wrong, but it's not worth saving that extra $5-10 just for a brand that isn't as tested/known. Go with Corsair or GSkill.
2) PSU. While that is a pretty darn good PSU, I always advise going fully modular. Why? Because even if you use all the plug-ins on a non or partially-modular PSU (the one you have know is partially-modular) it is still way harder to manage cables, and even airflow may be affected (depending on your case). Find a modular PSU is all I would say.
3) Have you thought about what CPU cooler you will use? You will need an aftermarket cooler if you want to overclock, and if you don't want to overclock, it may not be worth getting the 'k' series i5. Just something to think about.
Overall you're doing pretty good. Good luck!