For the time being, if you choose an ORD 700 (and I believe 145 as well, but I don't know for sure) you get an extra 5k on your sign-on bonus (total 20k). And, for what it's worth to your situation, the 175 has a pretty big training backlog right now, so you will likely have a gap after indoc. Some like that, some don't. Obviously there are many other factors to consider, but those are two that will affect you right off the bat.