Hi, I currently am on my 3rd palm pilot. I have the Palm Lifedrive, but for a new user I highly recommend the Tungsten series. They are user friendly and have enough memory to get started. For excellent medical software, try Skyscape.com. Also Handango.com has loads of software of all kinds. I love my palm I use it everyday in everyway, in and out of work. I call it "the brain". It has heaps of medical software as well as my music, pics, calender, calculator, movies, the list goes on.
Good luck, wouldn't necessarily buy from ebay, only because I think a warranty is a good idea.
Mandy