Thanks for the very useful replies. Another question: being a turbine I guess you need a type rating. What does it involve (ground school, a certain amount of dual time...) and what is the cost for that (just for curiosity, hoping that the employer is paying the bill)? Usually is the operator itself that can train you or you have to go in specialized structures?
I know multi engine time is much more valuable, but I am really fashinated by the legendary Van! Moreover I am still pretty young, I suppose I have plenty of time ahead of me to upgrade to twins, and I would like to do as much experience as possible on GA planes.