You did great, Misskitty--didn't overreact and get yourself arrested, nor underreact and get yourself kidnapped. Kudos!
To me, it sound like these guys were amateur, first-time car-jackers. You were fortunate in that regard.
Me, I keep my Glock 30 (with Heinie Straight-8 night sights) tucked into the map pocket of my car door, and I'm left-handed. I honestly thing it's an advantage to be left-handed with carjackers--the gun's right there where you need it.
Texas Hill Country
Big Dawg #1222