and the motherboard you should do a bit more research get the gigabyte's or EVGa motherboards ASUS are top of the line but with alot of faults and bad service :) and the case i would say get as big as possible because you will need in the future HDD's i will reccomend WD black caviar nothing other than that other are either overpriced or not good lifeline

mouse i recommend from razer or logitech same for keyboard and the headset you should go for logitech G930 :) its amazing

and monitor you should get the DELL U2713Hm 1440p :D