I would listen to your wife man. She knows you better than you know yourself, I guarantee it!!
It sounds from your post that your are unhappy with the white shirts, not the job.
If this is the case your leaving for the wrong reason, as someone else posted there are other departments out there that treat their people better.
Are you going to be able to give up the action of being a patrol officer for sitting in a firehouse looking at the walls?
Fireman in general are not the hard chargers that we as police officers are, the ones I have met have no problem sitting and doing nothing while they wait for a call, I myself would go insane if I weren't out on the street.
I am not slamming Fire personnel in any way, I just feel that 90% of the Officers I know would make horrible Firemen.