Where can we find a cofounder for a promising & growing product?

We are a growing software consulting company and to fulfill our own hiring needs , we built a very simple & easy to use(inspired by 37signals) applicant tracking system called Simplicant for small to medium sized companies (especially startups). Over last 2 years, without any marketing or sales staff, it has been growing slowly. We get a lot of customer interest (and at times from VC's too) and those who start using it totally love our product. We think the product is a great utility for its target customers.

However, since we are not based in US (our target market), it's very hard for us to take this product to the next level without on ground market & sales team/personnel that can help aggressively market this to potential customers. We want to partner with a passionate entrepreneur who would be willing to join as a co-founder of this product and lead the marketing/sales effort in the US while we provide strong engineering/product development.

What's your feedback on this approach ? What's the best possible way to advertising this opening ? How should we evaluate people who show interest in this proposition ? Thanks for the help. http://www.simplicant.com