Car Soup Type Website

I am looking to have a site made that is similar to [login to view URL], with the exception being that our site has to do with 'pets'. It will require all animal breeds and animal related info including, but not limited to: category (dog, cat, goat, horse and etc.), breed, sex, age, location (city, state), contact info and etc. I would like to be able to be allow to collect a fee for posting an ad. Ads will run until the pet is sold or traded, but no more than 'x' months (let me choose how long to allow). There will be a section for the public to ask questions on each of the pet profile pages, kind of like a comments on a blog, they will be posted below the profiled animal and the owner can answer the questions as well. All comments will remain for the public to read. When the ad expires, I would like it and the comments to be archived. Please visit [login to view URL] and spend some time getting to know the look and feel of it. I don't want the same color scheme, but I do want it to look similar, and it must be easy to navigate and easy to search for any breed, category, age, sex or anything else.