Only buy thinkpads. I just bought an awesome refurbished thinkpad from this guy:
http://stores.ebay.com/ThinkPadWorld
I saved a lot of money, the computer looks new as far as I can tell, and paying $19 more for 2day shipping got it to me 3 days after I paid him. I am not affiliated with that guy. I'm just happy with my new laptop.
If you want really good resolution, you need a UXGA screen.