Either PCs or Macs will be fine. There is wireless accessible throughout campus. It will be a little slow at times during the day due to heavy usage by students, but not unbearable. It's nice to have a laptop so you don't have to print out notes/slides (availible online in PowerPoint or Adobe PDF), though not necessary (I don't have a laptop and just do paper notes). More likely than not, if you have a laptop in class you'll just be goofing around on it.
That said, there are a couple of students in our class that have a laptop with a stylus, allowing them to easily handwrite in notes on top of the slides. It seems to be really useful when you need to draw in additional diagrams that aren't easily typed. In the end, it all depends on how you like to take notes.
Additionally, there are computers in the library, and you can check out laptops at the library for use in the study rooms (in the library, you can't bring them out).