I just posted in another thread about becoming a CFI and building time as well as to continue teaching.
A friend who is chief pilot at a 135 told me to get my CFI and teach. Not just to build time but to learn to sit in the right seat and "watch" what's going on, to observe and to guide. He told me to take it seriously, to create good pilots and when you do that for 200-500 hours and you didn't kill yourself and a student, you will be a better pilot.
He said there's a reason at his operation candidates that are for the most part equal in time, etc he will hire the person with CFI experience.