What laptop would be best that can run Battlefield 3?

I want to get a battlefield game... and I'll keep on all for BF3 to come down as my relative talks about how awesome it is on his laptop that is fast (bad company 2 and bf2).
It's a long relation connected how I enjoy a possibility of getting AN alienware.
It is just a dream right now, but it has a possibility of coming true.
Here's a link of comparisons to a laptop I saw from Dell that's an alienware:
http://www.dell.com/us/p/configuration-c…
Copy and cement if you hold to.
Or would I need thing more powerful?
Whether would I not be able to occupy a laptop at all and have to use a Top side? Because I visit my dad in Texas every now and then, and I want to take the laptop beside me (it'll be heavy, and I cannot play with it connected the way with my power inverter) but I still privation to know what laptop would be optimum to play bf3 MULTIPLAYER ONLINE 32 VS 32 NEXT TO MEDIUM-HIGH (RECOMMENDED: HIGH) GRAPHICS.