you just need to figure out what your going to be doing with it. like in my case i use my laptop at collage, work and around town which are all places that wouldn't ever want do any gameing so it only has a meager GeForce 9400M which is fine with me considering it's use and the fact that i didn't even bother putting windows on it but for general use it works just fine for me it can run all of my web, media, office apps fine and still has juice for pro tools hd and final cut, adobe cs3.
than i have my separate desktop for gaming.
i think this set is way better value for the money because the laptop suits all the needs i want a laptop 2 and has a swell 5 hours battery life when doing general work on it and is nice and compact. then got my desktop which can run all of my games maxed out on a nice big screen and a full-sized keyboard which is a lot more enjoyable for games than a card that just meets your requirements on a small screen with a small keyboard.