full fledged classified website

I need classified ads site. Lets say it will be full fledged classified ad site. I want the following in this site: 1. User being able to submit their ad, but only registered users. They register through FRONT END and post their ad. I want ads to be shown on site only after I aprove them. 2. EDIT/DELETE their ad after its aproved and posted online? Especially I want them to be able to delete their ads. 2. I want to hide some details from non registered users. For instance I want to hide contact info of all advertisments from non registered public. For example you visit the site, see nice ad and you want to call them. But you can not see contact info of that ad if you are not registeted. You must register in order to view that info. Is that possible? How? Any plugins to be used in order to make this happen or this is simple code for WP developer? 3. They should be able to upload images. 4. People submit pictures of various dimensions - horizontal, vertical photos etc. How do I unite them. Lets say I decide that my thubs will be all the size of 200*200pix, and when you click you get to the bigger picture. But how do I make this happen so that thumbs would look nice and not streched out. I mean thumb is square and if someone submits 300*900 pix photo and it gets resized to 200*200 won't it be streched in some way? How do I make unified resizing nice and easy? 5. There should a payment gateway where user can pay from paypal , credit cards or any type of card. 6. two languages support english and italian 7. a complete professional look