I'll preface this by saying I could get a little verbose, and probably this isn't the best place to seek employment advice. However, I consider a lot of people on this board to be friends, and I really value all opinions on this.
I have determined that, mostly due to working outside and handling a bunch of nasty chemicals (one of which put me out of work with bronchitis at the tail end of last year), I need to find a new job. The biggest upside to my current job is that I could doubtless come up with at least three customers who would be willing to give me a good reference. I've talked to a couple of them about my dream job that I have a chance of getting: a Systems Operator with Pacific Gas and Electric. (If PG&E were looking for sys-ops right now, this would be a non-issue.)
Basically, what I'm wondering is if, were you in my shoes, would you: wait for that dream job in hopes of keeping those good references intact, or say the hell with maintaining good references and get indoors and away from the chemicals sooner?