Either JB4, Procede, or COBB. If i had to do it over again, i would probably have gotten COBB. Just my $0.02.
The JB4/Procede are piggyback tunes. This requires uninstalling/installing in the ECU. Rather simple, but nowhere as easy as the COBB (for obvious reasons).
You wont have to worry about the car with any of those major tunes. Although, you WILL catch the mod bug. Its infectious around here, be careful!