Hi, although i am not a dental student yet but I am an IT person. Whatever you buy, you should try to get at least 1G of RAM, and 1.7+ GHz in processing speed. For one, I would not recommend Dell laptop since they are known to give out in a short period of time. Personally, I would recommend buying a IBM (or so called Lenova now) laptop, specifically and R-XX or T-XX model. I currently have a T-40 model and boy its been 4 years and stilll works faster than the ones that recently came out. Not to say i dropped it so many times. However, stay away from R-60 + up models, (this is around when Lenova took over) they tend to have alot of bugs in their software and are not as reliable. As for price, the last time i checked on a T-40 or so was around $1000-$1100 and this was about 1 or 2 ago so it might have dropped significantly. IBM are known to make durable laptops so keep an eye out if you are planning to buy one. One more thing, stay away from Compaq and Acer-cheap but bad quality. HP on the other hand are usually very bulky and big. Furthermore, if you can use tiger OS-go for a MAC 🙂 (but you might have some software compatibility problems which can be rendered by splitting your HD up and having both Tiger OS and Windows XP/Vista. Goodluck!
p.s If you know somebody that works at IBM- they get a lil discount