In order to run this game smoothly, your going to need some serious processing power and I'd recommend a higher end video card from Nvidia or ATI. No Intel graphics chip will work, most mobile graphics chips also will not work, most mobile chips that do will barely run the game.
You're looking at probably no less than $700 for a desktop machine that will run the game on decent settings, much more than that for a rig that will run the game on full settings.
To follow up with this, keep in mind that due to the structure and power requirements of a laptop, similarly spec'd laptops will inherently underperform their desktop counterparts. Don't be shocked if you have to pay double what you would for a desktop on a laptop to get equivalent performance (i.e.: spending $1400 to do what a $700 desktop could). Edited, Mar 11th 2011 3:25pm by bsphil