Food for thought, there's also a Budget rental car desk at the Doubletree on Hotel Plaza Blvd near DD. We got a very good deal from them our last trip, and they pick you up from whatever resort you're staying at.
We are going to Vero. We usually don't rent a car. I just want to make it as easy as possible so renting right at the airport appeals to me. So far Budget has the best rates.