I would consider this, if you dont go permanent at the next job youll be looking at your third job in a matter of 10 or 11 months. Probably not a great look to have three job changes in less than a year.
Does your current job give out a bonus every year? Do you get one at your new place? 15k a year more is a great chunk, but you will also be spending a little over a thousand dollars a year on gas with that drive.
Leaving for a new job isnt going to erase awful people, they will just have a different face at the new job. Offices are shady places.