Thanks for the detailed project requirements. I am sure you receive many applicants. So, instead of detailing what we can do, let me explain briefly what we can do differently.
1. Technology: We have the best coders lead by a Ph.D in computer science. But, by no means I can say that this is our USP as some other players in this forum also have excellent coding skills.
2. Design: We have a team of designers, who understand what it takes to design simply, effectively and at the same time aesthetically.
3. Support: We have a team of content writers, search engine marketers, dedicated web masters and system administrators who can manage your site completely end-to-end. Our support infrastructure is second to none.
4. Pricing: Because of the way, we operate (with least bench time, most scientific project allocation), we can provide the best possible pricing.
So, what we provide is not a piece of software code. We provide you highly qualified team members who will take care of the entire back-end web site operations, of course with significant cost savings.
We are interested in long term relation as that is our business model.
By the way, for the technology part, I do not think we require $3000. The system does not allow me to bid.
My assessment is that it is a 150 hours of work and at $9 per hour, this comes to $1350 and with prompt delivery, you can consider a bonus and make it a round $1500 :-)
But, as I mentioned, our primry interest is the long term association.