Get a droid and easy teather (or PDA net) you will have to pay for either of them if you want to access sites with https://
Also with prepaid know that unlimited is in fact limited. 2 gigs is the magic number for most. After that they will drop you like a bad habit.
You will also need a data cable for your phone. Most times the cable for the charger will work. Sometimes you have to buy one (not a big deal. Just check before you leave the store so you can buy one while your there if needed)