Great, welcome to NP's!
This is the type of thing I have been mentioning recently and that is needed. A central market. However, getting end users only to the market I believe is critical.
1. Are you planning on buying paid google advertising or have SEO to rank on the first or second page? Is so, this is a super development.
2. If not, do you have advertising budget for display or classified ads in trade publications or plans to target specific vertical markets?