I have a classified ads website that I created on wordpress with a theme called clasipress. You can see a demo of this site at http://demos.appthemes.com/?theme=classipress.
I would like the app to have most of the functionalities of the website. It would require the users to sign in or register at the beginning and then be able to browse thru the ads, contact the poster etc etc. Also the users should be able to post an ad if they would like.
Let me know if this can be done quickly and professionally. Do not answer if you do not have experience.