I feel l like that build is a bit overkill in the video card department. Since he says he wants to play LoL on high and surf the web and whatever, more money should be invested in the CPU. Instead of getting a 7850 you should get a 7770, and up the CPU to and i3. You also mention not needing a lot of storage space? Maybe you can get a 250 gb since you didn't use much of the 300 gb on your laptop. Just my opinion
Motherboard could be cheaper, and you said you didn't need a lot of storage space but you go from 300 gb which you said you hardly used to 1tb... well I guess if it's what you want. I've never seen that Mushkin RAM being used before, so idk if it's reliable.