With Windows 7 just a week away ( October 22nd ) there will be a few bargains on the market , especially in the laptop range as the changeover from Vista to Windows 7 begins
Make sure you get a laptop that has at least 2GB of RAM.
Windows Vista will just run with 1GB and there are still manufacturers ( HP , Compaq ) selling computers with only 512MB of RAM.
If you combine the 512MB of RAM with the security software that is usually bundled with the computer ( Norton Internet Security , McAfee ), you will be in for a world of pain and an extremely , extremely slow computer.
Get the 2GB of RAM ( may run you $100 - $150 ) , dump Norton , McAfee , install Microsoft Security Essentials or Nod32 ( a paid antivirus solution that runs quietly in the background) and you will be in for a much better computing experience.