We have now OsCommerce shop, which is quite suitable, but we need adding some new features. Most of them are available as ready add-ons. We need more convinient extra-fields. We sell clothes, if size is out of stock we have to delete it and then add it again. We need options size and color to be active/inactive in product discription. This is most important. What else: minimum sum order, prices viewed by registered users only, and couple more.
Now we have our shop in 4 languages, it has to be slightly improoved and we need small additions to SEO TAG modul.