Which PDA for a vet/medical student to get?

Help! I am a veterinary student, graduating this May. I want to be able to access lots of information at a moment's notice, if necessary. I would like a PDA (not a phone) that allows me to access the internet and access sites like VIN and my email. I also need to be able to load lots of Word, Excel & Power Point doents onto it. The ability to edit these doents would be nice, but I really just need to be able to view them. I would also like to be able to use some of the PDA veterinary products (Plumbs, 5-minute consult, etc.). I was looking at the iPod Touch at first, but don't know if all this can be done from that.