What laptop should I buy for school?

As you may know by the title, I'm in the market for a laptop for school (and minecraft) let me tell you what I need

I will be attending my senior year next year (when summer break is over)
After that I will go to college for mechanical engineering, so I figured I better get a laptop now.

Also, I want to be able to play mine craft mod packs, like the big ones with high framerate

So anyway, here is what I can get:

Alienware 18 ($2099)

Or anything under 1300

I wwas thinking some slim laptops, like ultrabooks

Brands I'm interested in buying:
Toshiba
Samsung
Asus
Let me know what you guys think

(I want the Alienware because it has dual graphic cards)

But if I can get a bigger bang for my buck tell me

You should by lenovo laptop.

Asus Transformer Book T100

I have a lenevo y50 which runs my minecraft and work stuff without any problems but if you want something with dual graphics cards then the lenevo y510p that thing is a monster and is very affordable

ASUS Transformer Book T100

Chromebook ( Cheap, but you can't download anything ), if you want get TOSHIBA Chromebook