Sandlapper,
I took one bonus in 1996 (12k/year) as I had a dream job waiting (F15 IP/Europe) and no airline leads. My wife and I wanted to continue exploring the world, our girls were very young, and I was having a great time in my career. In 2002 I passed on the 25k/year to 20/25 years as I wanted to settle down, become part of a community, and puruse an airline career. So...I've been on both sides of the issue.
Best way to solve this ask yourself what you want to do next 10 years. If life outside military is the goal (airlines, law school, business, contracting etc) then no amount of money will make you feel good when you get shacked for a 120/180/365 day contingency TDY or remote somewhere. You will also hate not flying and being on a staff tour if you didn't want to be there. There are no guarantees in the airline gig, but IF you can get a job the Q of life (for some people--myself included) is very enjoyable. On the other hand, if raging around the world in a C-17 is a dream gig, or you love teaching in the T-6, getting another 25k a year for something you love to do is awesome.
Whatever you do, don't get overly enamored with an extra 2k a month. After taxes, what you have left will pay a mortgage or keep you in a nice car the rest of your career. However, talk to a year 2 or 3 guy at FDX or SWA and ask what they have to do to make an extra couple grand. If you are willing to work a bit, you can GET the money. A year 2 guy at FDX can pick up an extra trip or two some months and easily make that much. Also--you can make 25k with ONE GOOD DEAL if you become a realtor, or by selling a few mortgages a month on the side. You may have other skills or abilities you can market on the side. Again--I'm not saying making 25k year is peanuts, but if you are willing to work to get yourself into something besides just flying for the AF you will likely find a way to make a few extra bucks. So...follow your heart, don't chase dollars.
If security (pension, 2 checks a month, etc) is paramount it is hard to beat the military. If you are more adventurish, perhaps you can find something good on the outside. I know there are a BUNCH of smiling faces on former military guys at FDX who bailed out early, and even though we passed on a pension and the security I don't see a lot of moping and sulking. Guys at Delta or AA might tell you a story 180 out, however, so its a very personal decision.
In any case, with C17 or T6 stink on you finding a part-time ANG/Reserve job should not be too hard. That would allow you to straddle the middle ground--chase dreams outside the service but still have a job that will feed the family in hard times. It also allows you to look in the mirror and still see someone who serves the nation. That angle worked for me--not for everyone but I have enjoyed every minute.
Good luck and keep us posted.