What did you do as an intern? If it was related to business development or sales, you should expect to make something in the 45K-60K range.
If sales, how's commission structured? Is it more base than commission?
To to the OP, I'd really ask them what you'd be doing as "the business guy" because if you throw out the first number without having a clear idea of what typical comp is for a role like yours, you're not bargaining well or positioning yourself for a better turnout.
Despite the business the company is in, seems like real-world salaries apply to the other positions.