211833 Clone Site + more features

I'm looking to create a site like [login to view URL], [login to view URL] and ifreelance but taking the best features of all and creating something new and improved.. I've seen lots of projects posted of clones like this so I'm hoping 70% of what I want is all ready out there ready to go. Working demo would be great if you've competed a site like this before. Can be in PHP or .NET / MS SQL or MySQL Thanks for your time.