Hi,
I'm a asp.net developer. I think you should build your website by MVC5 with SQL server 2008 or 2012. I have done more than 10 Online Shopping websites with Online payment via paypal and master card.
Not only for front end, I have a best administrator that support page builder like wordpress, settings, roles, send email, schedule job, product manager support color, properties, categories..., library, orders.
I can design admin and website like what you need.
If you want, i will send you a demo for shopping site and administrator.
Hope that I have a conversation with you to understand what you need, about design. Please contact me as soon as you can!
Thanks you very much!