I went to a job fair in Miami when I was a newly minted 250 hour CFI, and the guy at Air Cargo Carriers grabbed my hand to sign up and gave me a class date. For what ever reason, I didn't do it. He looked at me in disbelief. I occasionally wonder to this day how my life would be different if I did it?
In your case, at 1500 hours you can go to a 121 regional. It is of my opinion that the 121 world is much nicer than 135.