At B6, realize too that Long Beach is a 320 only base, so if you get the E190 out of training you'll be seat locked on it (and thus commuting to BOS or JFK) for 2 years.
In my class the 190 actually went pretty senior, but that's not normal. Bids from training are awarded based on age, and since you can't predict where you'll fall in the class, I'd be prepared for a cross country commute for a minimum of 2 years.
JetBlue has been great for me, and I really like knowing my company has never furloughed a pilot or declared Chapter 11. But I live on the east coast and have a 1 leg on-line commute. Your mileage WILL vary.