I am interested in discussing the potentials with this site, and I would have a laundry list of questions (eventually at least) to go over the details. For the moment I will go into details related to business/partnerships.
First, I normally don't do these kinds of things because often there is no security and the person wanting a coder has nothing to offer. You say you have the business and sales background, but what else can you bring? I think it is fair for the coder to not have any financial burdens up front, as it is significantly more work on their part to make this work. Would you be willing to take the up front costs?
Second, who will manage this? I presume since you want to incorporate that you wish to have it split, but are you sure that you don't want to just hire a coder (like me) to make it and then take it all for yourself? I understand the rationale of a partnership in this situation if you don't have the ability to pay up front, but finding a good partner will take a SOLID business plan and cash.
Third, how much have you thought this over? I don't know if you just want to compete with this other site or if you have seriously considered all features and have a solid outline of what the site should accomplish.
Last, 1-2 years is a long time, what is so complex about it that it must take so long?
jeremy - gnomeontherun
Educated questions often get educated answers, and simple questions often get simple answers.