Is Contao / Isotope eCommerce Right for me? Help.

I've been visiting the Contao website for a few days, as well as watching some of the Youtube tutorial videos (At least the ones that were in English). I think this the product for me but would appreciate some feedback.

I need to create a website that has a shopping cart, and a password protected portal that customers can log into to track their previous orders, see special price sheets, etc. Can I do that with this? If so, which extensions would you suggest? Also, is there a way of browsing extensions by category?

Thank you!

I think contao and isotope is right for you. No other extensions needed. While building up your page you will find some usefull small extensions for special requirements.

You can search for extensions from BE. Not really by category. You can search for extensions also via searchengines, ask in the forum or in english irc channel on freenode #contao.