Someone asked about deals - you may not be able to wait this long, but every year the big names run back to school specials, usually in August. They give great deals on everything, including laptops. I can almost guarantee that the current deal on the Vaio S series will be duplicated or topped later this summer.
Also, a lot of big name resellers have an outlet store where they sell older, refurbished models. Some of these have technology that is perfectly fine for law school and they are usually backed by the same warranty you can get with a new computer. The prices are usually several hundred less than when they first came out.
Another thing to think about - Intel just released a new technology series for their Centrino brand. Most computer makers are still in the process of updating their lines. Once every laptop model is sold with the new Centrino line, there should be amazing deals on old Centrino models. And the performance difference between the two is not so substantial that you couldn't use an older laptop for law school.
And another thing... CDW-G is partnered with a ton of schools and provides relatively good prices on hardware and software. I've never actually purchased from them, or spoken to a rep, but their website lists a number of good deals. You can check it out here