If you end up on the ERJ side, DFW won't be an option. IAH should be easy right after training. If not, you can get it within a few months. It's still the biggest ERJ base and I don't expect this to change any time soon. Basically, if anyone is starting training for the ERJ side of the house (and the overwhelming majority of the new hires are), you can expect any base except DEN. As far as I understand, the classes for the CRJ are way smaller and less frequent, so logically less likely to get. Good luck!