Website where everyone can post offers and searche

I want to create a website where everyone can post offers and searches for a ride. The page should be similar to www.needaride.com.au, but the design should be similar to http://harburg.pendlerportal.de/

I want to use Joomla for this, possibly with a modification of the Classifieds component and integration with CommunityBuilder Extension.

There should be a simple and an advanced search form, it should be possible to do related searches for working days only and advanced option (non smokers only, luggage allowed, fuel cost sharing etc...)

The design should definitely be similar to http://harburg.pendlerportal.de/, and should have a clean, simple layout with a touch of Web2.0 interface. It can also be created on an existing template (if there is an existing one, I don't know of any)

Database: MySQL

Operating system: Linux

(150-250$)