Tempered expectations. Regionals are currently operating under pre-existing contracts, where there really isn't much room to throw more money at the pilots. Sure, some regionals probably have a little more room than others. None of them are going to cut their nose off to spite their face right now. And if one does, those pilots may end up being paid well on their fast-track to the unemployment line. Pay is going to take time, time to negotiate new contracts with the majors or rework pre-existing ones.

One regional that is growing like crazy today is dying on the vine tomorrow. Some have grown to a size that any future growth seems minuscule. Some regionals have a strong track record, while others are considered less than favorable amongst the masses.

The point is, its highly unlikely that you will find one regional that encompasses everything you are looking for. You need to decide what is most important to you, because this is YOUR career, and go from there. Sounds like you've already done some great research, the best advice you can get from the community would be to choose the one that suits your interests and goals best.