Highly likely you'll get the 145. Lately they've been offering guys a choice between ORD or LGA on the 145. I'd imagine 145 in one of those two bases will be your best bet. There are a lot of current 145 LGA FOs bidding MIA. LGA will in turn need more new hires to go there. Yes, DFW is a very popular base with lots of guys wanting to get there. Good news is, things are moving very quickly with the upgrade time dropping lower every few months. As long as you get on the 145, you'll eventually get whatever base you'd like at some point down the line.