Web Based Project Management Application by VenturSum

I have a website where clients post a request for quote (RFQ) Once the RFQ is received, I'd like an application to manage the RFQ through becoming a Job and being billed. I'd like the RFQ to post to a bulletin board (Not unlike Freelancer)... (Budget: $750-$1500 USD, Jobs: .NET, AJAX, C# Programming, PHP, Website Design)
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