The salesmen will try to tell you that you need a $1000 laptop. For most people, including a geek like me, this is not the case and we can manage quite well with the laptop priced just above the cheapest one.
The cheap computers are slow b/c of all the junk software that each company puts on them. My first step with a new computer is to get rid of all of the "bloatware" that HP, Gateway or Dell install to try to get you to buy full versions. A simple google search of bloatware will tell you what and how to uninstall.
After uninstalling this junk, I usually end up with a computer that loads and runs twice as fast. Just as fast as a laptop twice its price.
Unless you are doing some heavy video editing, you will likely find a cleaned up computer in the $600 range is more than sufficient.
By the time you may need it to do more...then you will be probably computer savvy enough to throw an extra RAM chip in... which is a total breeze.
The salesmen love to tell you how much RAM you need as they know that you can't get 3GB without a webcam, huge harddrive, and super duper video card that you don't need.
