I need a clone made of Flippa.com

All functionality needs to be cloned, and a similar design should be created as well.

Must have a backend admin area where I can edit users listings and settings.

Website must be coded in 100% valid, tableless XHTML and CSS. Tables can be used where appropriate, but not everywhere. Must use clean separation of CSS and XHTML markup.

I would like to make the listing fees FREEm and instead offer upgrades to the listings, such as BOLD listing for $10, or HIGHLITGHED listing for $15, etc. So for larger sites, like $4000, instead of paying 5% ($200), they would only pay $10-$25. So PRICE will be a large factor. Also like said a nice design will help too!

Project must be completed ASAP.

You will be given cpanel access and should install the site on my server and deliver the PSD design files as well as provide support afterward for a week or two.