Do lots of research, visit the quickie programs, talk to their students, and please don't pay to sit in the right seat of anything, its just not worth it.
I've got to ATPs for my MEI and my ATP. They did what they guarenteed, I just wouldn't say I learned much. For a full out 90 day program, it might be an interesting ride.
I wouldn't discount the FBO route either. Check in your area, you might be surprised to find a few have the same "career pilot" programs for cheaper. Plus you get to stay at home and will probably get a better experience to boot.
Checko