This is kind of a fun one. I imagine you're coming to the US for a vacation, plan to buy the car, drive around for a while, then sell it.
A camry Solara convertible would be nice, but out of your price range.
How about something like this:
http://www.autotrader.com/dealers/vi...s=IVNLBDLNDS59
The price isn't listed, but it better not be over about $3000 - you'll spend the balance on gas, but each of the four of you can bring a friend.