Flyboy... The fact that you already have your degree at 19 is pretty incredible! Congrats! As far as everything else goes....
2 things.
1. I can't believe I'm about to say this... But I agree with Shyguy - there isn't a "best" regional. Get your time in and get out. Doesn't matter what you fly or where you fly to.
2. Again I agree with another comment here. CHILL! You're 19 and want to start your career. I've been there but I got my first job at 21. Take it from me... Flight instruct, build time, enjoy your life, chase some women, and do some crazy things with your friends (keep it legal!!). Once you start flying for a regional your time at home will literally be cut in half (if not more). So enjoy your time while you're building hours
But most of all... GOOD LUCK and have fun!! You're in a damn good spot. Keep working hard and enjoy!