Gumaark, as everyone else has said, if you are worried about being posted somewhere out of a capital city, go for enroute.
Yes you get to put down preferences, but they, in the grand scheme of things, mean absolutely nothing. It sounds like you want a capital city......so does everyone else on the course!
If you aren't 100% flexible and willing to go to any location, then go to enroute. In my course, quite a few people went to places not on theirs, or anyone else's preferences. Some didn't have 100% confirmation until a week before they where supposed to start.