My first airliner was the Brasilia, and it was a monster to learn, but a ball to fly. I've heard nothing but great things about the Dash from guys who flew it--they are almost wistful about the Dash as they are about a lost love.

That said, I agree with wt in an earlier post: I think everyone should start with a turboprop, but jet time is the necessary step. I flew the CRJ for 14+ years, and while it has its drawbacks, it's a great airplane and I loved it. Tell your buddy to get the jet time. If he wants a job with a major, he needs to be competitive.