Choice 4) Shop around and build your own desktop for less than the Alienware laptop giving you more space for future upgrading. : )
I don't know the price of components where you are but my rig was bought as is and cost £500 a few years ago and the graphics card, which was added more recently, cost me £75. I'm fairly confident, once the patch is out, that it will run CloD pretty well (Though not at full graphics. Believe it or not, Medium settings look pretty nice!). The equivalent of mine nowadays would cost an awful lot less and, in fact, even cheaper if built from scratch.... that applies to PCs that would trample all over my one as well
If you shop smartly, you should be able to build a good enough machine for a really reasonable amount of cash..... with the added bonus of being able to just pop a great graphics card in once you have a job (I'm assuming you don't have one at the mo.)