Sorry I haven't been on in a while, but I have been waiting - still wating on my Laptop. Although Alienware is a bad company to purchase from, I am somewhat stuck. As for the "Dell Inspiron M1530 XPS laptop", it has potential but it only has a single NVIDIA® GeForce® 8600M GT card. With "dual" 8800's you can throw nearly anything at it and know that you won't be dissappointed.
Upgrading a laptop is nearly impossible, besides upgrading ram, replacing an optical drive - keyboard, and in some cases the the soundcard. You'll need to to consider what you want in a laptop (what you need to from it), but your more likely to get more for your dollar if you just buy a desktop that you can build-up.