Advanced e-commerce site

Advanced e-commerce website with long-term commitment from provider. The most important is to find a provider that we can work with long-term, basically can produce high quality with favorable pricing structure. We have at least 5-year plan with this, so you need to prove for us that you can commit on the long-term. The site we want to create can be compared to [login to view URL], in the aspect that we with one backend shall be able to control many front end websites. Regarding with e-commerce solution that shall be used, we leave it to provider to suggest. For example if it should be Magneto, OS commerce or anything else. You also suggest commercial software platform , for example totally base on Microsoft (asp.net, MS SQL etc. and so). In you bid, please include pricing for software. I complete specification will be sent to provider, when confidential agreement has been signed. Some specifications can be outlined here though: - Manage all websites from one backend (update front-ends, process orders, update prices etc.) - Initially only a couple of websites but solutions shall be scalable. - Possibility to advanced searches, for example in brands - Possibility to integrate with suppliers warehouse (through XML) in realtime - Possibility for user to review and grade products - Able to customize based on countries, regarding tax, languages, - Web 2.0 features (AJAX) - Single page checkout Again, the most important is to find a long term cooperation.