Looking for suggestions on negotiating Compensation/Benefit package for new opportunity

I am in the process of being courted by a former employer to head up the finance function of a new company. The role would be a mix between controller and CFO and entail building everything from the ground up. The group is buying an already existing company with plans to leverage their experience and startup capital to expand from a $25 million retail business in the first year to about $100 million within five years. From my knowledge of the people and industry this is absolutely feasible, and intriguing even though I am fairly happy in my current job. As a result of them contacting me about the opportunity and my current position I feel I hold a lot of leverage at the negotiating table. The President of the company is putting up all the capital and the COO is getting ownership through a debt note to the President. Both the President and COO are 20 years my senior and experts in the industry. I am the young rising star that has already proven his worth to the President in the past. Given the circumstances presented what are some suggestions you would give a naive 33 year old to ask for that I might not have the experience to think of? What are some unique benefits, ownership proposal methods, bonus structures ect. that you have seen, or asked for yourself? If I take the opportunity I am trying to avoid kicking myself in 5 years for not structuring my compensation and benefit package properly for this type of opportunity. I fully understand that a lot of it depends on whats important to me, but try to answer from a more general sense. Thank you for sharing your experience and knowledge.