Commercial and instrument. If you're selected, they'll train you to proficiency in the aircraft you'll be assigned to, including water landings, emergency egress and survival.
Being familiar with turbines is a plus. You won't get enough IFR to maintain proficiency unless you're in an IFR position, so consider how you'll maintain that- you'll NEED IT when you need it. The traditional 180 turns worked for me for 13 years, but not everybody's that fortunate. Flight Sims are better than nothing...