Holy shit she's buying it FOR you? Like wtf get good grades it's basicly $2k I think good grades is worth that wtf....
I would have gotten the m17X if I could afford it. The M15X plays most games on medium or high. I imagine you will enjoy the M17X.
But if you're just using it for home use, why not get a desktop? You get more bang for your buck.
I got a laptop because I cant afford to keep a desktop at my mom's house, my sister lives over there and mom has a pet rat that chews everything up. I can put my laptop up though where no one touches.
Glad I could help ^^