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I think http://www.hse24.de/ is the best
In My Opinion souq.com (easy to use , simple)
I prefer eBay.com but i think its need some UI-Design to be fixed
Here is the list of best designed ecommerce website list to take a look at for inspiration:
http://www.awwwards.com/20-of-the-very-best-e-commerce-web-sites.html