My girlfriend sent me this partlist, is it ok to let her build it? Is it better than an Alienware X51 AX51R3-10BLK ?

http://pcpartpicker.com/p/K2vRpg

Not sure if I should trust her to build it, she said she has built one I7 one, but I doubt it. I need to run windows and her computer ideas don't even have windows.

Is it any good compared to this?

http://www.amazon.com/Alienware-AX51R3-10BLK-Desktop-Intel-NVIDIA/dp/B015XK1T4M