I need a bidding portal

Avg Bid (USD)
Project Budget (USD)
$250 - $750

Project Description:
Hi my friends,

I need a portal for bidding where: seller may create new product or whatever they want to sell or whatever they need, then other member may bid in...

1. The portal should be built in a professional ORM, 3 or n layer
2. Ajax enabled but don't slow down the site.
3. Simple, easy to use but professional.
4. All documentation is required.
5. Member profile with feedback and rating features in detail enough.

Skills required:
.NET, ASP, C# Programming, PHP
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