My fiance and I both have Toshiba laptops. I've had mine for almost 2 years and haven't had a single problem with it (knock on wood!). The only downside is that it's a bit bulky to drag around. I'm going to get a Toshiba netbook to bring with me to class to take notes.
If your program requires you to use specific software, I would be wary about getting a Mac unless you are comfortable with things like having 2 operating systems on your computer. I'm not a big Apple fan though--they're good for professional graphics, that's the only positive thing I have to say about them.
If you want more specific suggestions, what do you plan on doing with it? Do you plan on bringing it to class with you? What is your budget? What do you expect from it (good battery life, being able to play DVDs, being small enough to throw in your backpack)? Are you interested in desktops, laptops or both?