Labtops are great! They are like laptops, but for scientists!
Anyways, get a laptop/notebook computer with an Nvidia GeforceGo 7x00 series GPU. You should be able to play WoW no problem. I brought a HP Core2Duo laptop with 2GB of RAM and the Go7300 chipset and it can play Company of Heroes, C&C3 and older games like UT2K4 run really well. It cost £800, so thats about $1600 buckaroos. Oh and make sure if you get one with Vista that it has 2GB of RAM. 1GB really isn't enough.
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Currently playing: RCT3(PC), DMC4 (PC). SW: Force Unleashed (PS3)
Favourite Game of All Time: Streets of Rage II (MegaDrive)

Intel C2D e6700 @ 3.33GHz |Gigabyte - GA-EP45-DQ6 | MSI NVIDIA GeForce GTX 280 1GB
2x Raptor 36GB in RAID0 (OS), 5x Seagate 250GB in RAID5 (1TB Storage)
CORSAIR XMS2 Pro 4GB (4x1GB) | LG L226WTQ 22" Widescreen TFT
Creative X-FI | Vista Home Premium x64, Suse x64.