Dave,
Don't discount observer so quickly. Look into the role and its training. I did 7 years as an observer and had a great time. The flying was awesome and I even got to do quite a bit of "poling" (i.e. flying the aircraft). I found myself in the same boat as you for slightly different reasons and opted for Obs because,at the end of the day, I really really really wanted to be aircrew.
It has been possible in the past for Observers to go Pilot. I know of one case only (although there may have beenone or two more recently,more up to date individuals may give you some accurate figures) and that particular individual had a tough job just to get the opportunity.
Anyway, good luck with whatever you decide.
CTF