I like your way of thinking.

Here is my take.....if you want to move on from the regionals, you need PIC turbine. If Mesa offers a quick upgrade I would go there. Suck it up.....get at least 1500-2000 PIC turbine before you make a move anywhere. You will never lose that time once you have it and you definitely won't get anywhere decent without it. Unless you plan on making Eagle a career, I would steer clear. PIC Turbine is the key. Good Luck.