Unfortunately, there is really no solid answer to your question.It's sort of a crapshoot.
What exactly DO you want to do with your computer? My plan is ...1. Run exam software.2. Run legal research software and browse the databases.3. Write papers.4. Take notes.5. Organize hand-written notes into typed versions.6. Get email.7. Browse the web, especially the mandatory parts where you pay your bill, or check for changes to the exam schedule, and so on.8. Eschew lawschooldiscussion.org.9. Sell my furniture, clothing, parents, and dog, on EBay to pay for law school.
The one PC feature I will pimp, which is actually software, is Microsoft OneNote. My understanding is that OneNote doesn't work on Macs and Macs have nothing similar. In my opinion, it is the single greatest note-taking software around. It's like excel and word had a totally usable baby. It allows you to create separate tabs for each section of your "notebook" (e.g. my notebooks are Law School Semester 1 and 2 and my tabs are the names of my classes), then allows you to create separate tabs within each class tab (so I do a new tab for every class). I can title them as well (say, Diversity Juridiction, 02/04). It has word processing capability and it creates these boxes around everything you type so that you can drag and drop your text all over the screen. PLUS it allows you to highlight the border of the box and copy everything with ease (very handy for outlines). It removes the spatial limitations of word so you can type anywhere on the screen, whenever you want. Oh and you can print to it. So I guess that is more of a recommendation for One Note, which I LOVE. If you can get it for Mac, sweet. If not, just a head's up on an awesome PC feature.
If you like windows, get a Lenovo (thinkpads only).