I had a great time at airBaltic. If you plan on moving to Riga if you get hired, you'll have a great time. However, every form of commute will wear you down really fast.
Dash is one of the better types to be on when it comes to rostering, at least compared to F50. Great crews. Probably the best type chief pilot in the world!
But the scheme with paying for type and line training would make you obsolete in six months as there are other guys knocking on the door... Do not expect to be hired in that case. So if you are to spend your hard earned cash, is the Q400 the one to bet on?
Best of luck with your career!