I’m interested in helping you out here. I noticed your template before and was quite impressed .
I have emailed you a link to a WordPress template I am working on. I can give you access to the back end, so you can see how easy it would be for the end user to modify.
I would ONLY be interested in taking 60% of the sales, no less though because coding the functionality will require a good amount of time. And the time to support end users can not be quantified.
I think your template can be achieved using a customised version of the thematic framework, which is released under the GPL , superfish for the menus, and a nivo/Anything slider for the home page.
I would probably use a google font for the typography.
We can discuss matters further you are interested.