I agree with Cholula not only because he distributes (or used to, for that matter) a great hot sauce, but because his words are sound to the market. I'm a hoper of change and perhaps someday down the future, Hawaii will accept that not everything has to be jet-powered aircrafts. We'll see how FlyHawaii performs in that regard.
Otherwise, why not an ERJ170/175/190/195? Those are much larger than the dinky ERJs that most mainland airlines fly and they have that jet airliner feel. Not as big as a 717 or a B732, but still a nice compromise.
That's without considering the operating costs of the EJRs, however. I read somewhere that those babies cost a pretty penny to run. Can't imagine that Aloha's 737-200s are any cheaper, though.