Online price matching webstore in the UK - repost

Professional website showing wide range of goods, this has to look different with some new ideas to make this stand out from the rest, SEO integration at root level semantic setup to WW3 standards, link to pricerunner and other sites, must be able to be be groupon discount enabled, sagepay integration with a one click payment page, no registration required for purchasers, control panel with easy CSV and XML integration for adding products and product categories, social integration with facebook store marketing, amazon and ebay connections to enable multi channel selling. If you have new ideas to make this something special then we offer prompt payment at tiered stages. This needs to be the next advancement in selling on the internet. Hosted in the UK this needs to be very secure, and load fast. If you are up to the challenge then please quote. All code and work is owned by the vendor in the UK.