if you have a good gaming rig then you dont need a very expensive laptop at all.
Get a dual core (Core Duo or AMD X2) for sure. Atleast 2.0ghz. Future of everything, single core is a waste of money now.
2gb of ram...eventually Vista will be worked out and you'll be glad you have the balls to run it. Even if you only have XP, 2gb makes sure you wont have any problem with having multiple app's open (Music, word, internet, msn/aim, etc).
If you want to do a little gaming on it, get a small dedicated video card. Stay away from shared ones, they blow, I would know because I have one.
Almost every laptop has a decent wireless card, make sure its brand name and you'll be fine.
shoot for 100+ gb of HD space, it gets taken up faster then you think.
If you want some actual links to one you can buy, then say so and i can show you some shit