I was at Mesa for almost two years before going to ExpressJet. I'm about to be furloughed as well, but there is no way in hell I would ever go back to Mesa.
That being said, if you do decide to go there, I would ask for the Dash 8. Better quality of life and no seat fence. You'll be able to upgrade on either the Dash or the Jet. It won't matter though, they will put you where they want. I asked for the Dash or the 1900 and got the CRJ.
Anyway, if you really want to know about life at Mesa, or have other questions shoot me a PM and I'll answer them for you.