Online store

Hi, I am searching for an online store builder, this store will be a bit special, not physical products, this will be a webmaster store so the categories will be like this: - online stores - banners - logos - company web (simple site with home, about us, services, contact..) - videos - flash intros - blogs - forums - backlinks - twitter, facebook, youtube... followers - visits - articles - etc - You must create all categories and all the products (services) - Must be in english and spanish (i will traslate it) - Social networks share buttons in each product-service (fb, tw, +1, etc) - A message shown in the site which everyone with better prices could contact me - It will be helpfull if you can show me a template which we can use for the site, i was thinking in prestashop but you can use another script.