Hi again
The Q400 is a wonderful bird isn't she (obviously not talking from experience), I would love to fly her, and a wonderful learning curve she would be too, the only problem in doing a Q400 TR is that there is only one operator here in the UK who flies them, FlyBe, I would love to fly for FlyBe on the Q400, but obtaining the TR up front limits you to this company only, not a bad thing if they hire you, but if they don't then you are stuck with a pretty useless TR if you want to fly in the UK.
Instructor's rating for me after the MCC, then I'll look at a SSTR, how far are you in your training pilot-320?