Agree with 777 on the ICUS issue. (you'll be waiting a long time and expected to pitch in with the work at the office under the term 'commercial experience')
You've been warned!
I don't agree with flying a Baron for speed limitations though, that is where your ICUS/line training comes in. You will be pretty comfortable with any twin after 30-50 hours on the line. I went from a duchess to cabin twin with no problems whatsoever along with everyone else at the company.
In fact a PA31/402 type twin is easier to fly than a smaller trainer. Provided you understand and nurture the engines you will have no problems.