Good day,
I have read your requirements, and I'm advising for going with magento, and a custom responsive theme to develop your dream from ideas to fully working site. The reason for choosing magento would be that, one, I'm very experienced in using it, and two, because it's one of the most powerful ecommerce cms applications around.
Looking forward to hearing from you with further clarifications and questions regarding my qualifications.
Very respectfully, Adrian Oporanu.