I'd vote for the 35k-40k plus commission and bonus, but it's highly dependent on what they're expecting from you in terms of numbers. If they're expecting 100k, 500k, or 5m in sales, you're looking at very different salaries.
I think you should get a clear understanding of what they're expecting from you before putting any number out there. Ask for a bit more than you think is reasonable. Be prepared for a sub six figure salary though, you're young, with little (right?) work experience, and it sounds like they have had a lot of turnover in this position. If they were offering big bucks, they would have poached some big pharma sales reps by now.