Complete Custom E-Commerce Site Design and Completion

I'd like proposals on a complete website redesign that will allow us to do the following: *Add products easily on our own once set up. *Allows for multiple drop-down options ie. Size, Style, Colors, Custom Text, etc. *Must prevent false options from showing. *We want a mobile-optimized version of the site and a full SEO marketing plan put in place. *We need categories added based on our specifications and appx 1,000 products added. *Lastly, we want the entire site made live with all merchant accounts in place and functioning. Our goal is to have this site handed over where our responsibilty going forward is to maintain it. Our current and seriously lacking website is www.texasbling.com. We like [login to view URL] and shirtpunch.com. I hope this gives you a feel for what we're looking for. Please let me know if I can clarify further! Thank you!