Just remember that they need you more than you need them. If you tell them you are only interested if you get the 340 I'm sure they will give it to you. It's only my opinion (others feel free to comment), but I would try to get the Saab. You will get the MHT base before you know it and will be home 7 nights a week + your drive up rt 101 to Manch will be a piece of cake. If you do the morning shift, you'll show up at 5am and be home by 2pm, and then have 3 or 4 days off in a row.

Other points:
-FO pay is the same regardless of aircraft
-You would have to commute
-Have to get a crashpad in Newark (on the same pay)
-Slower upgrade

I would try to get the saab 340, upgrade on it, and then transition to Q400 captain if you really want to fly it. Again just my opinion. Give me a call tomorrow if you want - take care