1) Racing teams (specifically Scuderia Ferrari) - I'd love to be a race engineer...but i'd push a broom for 8 hours a day to be on the Ferrari payroll.
2) NASA - SPAAAAAAAACCCCCEEEEEE! Let's go to space! Space! Space! (but seriously, I'm all about that aerospace)
3) USAF - I'd love to be a pilot if possible, if not, there are many other jobs i'd do
That'd have to be my top three. I'd love to do all three.
Chances are I'll never work for Scuderia Ferrari or any F1 team for that matter. Race Engineer will probably be just me tinkering with my own car in my own garage.