dcpilot:
I made the same decision less than a year ago. Because I was older, I figured that I'd better get my training done as fast as possible. You have about 20 years of a airline career ahead of you. Get your CFII as soon as possible.
Are you married? If so, make sure your spouse reads this forum also, because you will be dragging her through this for the next few years. Talk, listen, talk, listen.
You'll find it very hard to evaluate the various flight schools, because it is very subjective. I talked to several pilots from various schools. A buddy who went to FSA liked FSA, but also had good things to say about ATP. Same was true with people at ATP -- they had good things to say about FSA. Conversely, there were also people out there that were so polarized that you just couldn't feel confident that you were getting good advice.
I did my training with ATP. There were many reasons leading up to my decision, but two of the big ones which may apply to your situation were:
1. ATP program was faster (90 days).
2. Total multi-time when I was finished (MEL/$$$).
Do your homework. Look at the posts in the flight school section of this forum. And talk to people who have been there!
Good luck with your career decision.
-sixpack