mikecy, maybe you can talk to the guy that's selling you the laptop to let you run the free version of
3D Mark 2006. If you like the way it performs and if it scores more than 3000 points, then the laptop will play SH4 very well (i don't remember right now if the basic version of 3D Mark allows you to get a score, but you'll be able to tell if the computer is fast enough).