E-commerce site for a unique product? Which platform to be used?

Hi Warriors,

Just the other day, I got asked by one my offline prospects to build a simple e-commerce site. I don't normally do web design (I offer services like SEO, PPC management, email marketing etc) but since he was referred from a good friend of mine, I thought i will take him as my client (besides, i can up-sell my services later).

He has been selling this rather unique product offline successfully (traditional wholesaling style), which is basically a liquid (natural ingredients) to eliminate all the bad stuff (like oil, chemicals etc..) from row food.

Since he is selling just one product right now, I initially thought to set up a WP site with an e-commerce plug-in etc. but he actually wants to add a few more different types of products in near future, which are all to do with health, organic stuff (probably like organic/natural dish washing liquid or something like that)...

So I suggested to have a website and create an individual product page so that I can do SEO per page separately. e.g. greatorganiclife.com/organic-tile-cleaner/..

Now, my question is... what type of website platform would be suited to this client? It needs to be very search engine friendly, good CMS and obviously a good shopping cart system to handle all the online sales.

Since I'm not an expert in the web development field, I will have to outsource this work to someone who can do a great job.

I'd appreciate any suggestions and/or recommendation of some good web designer (with a reasonable fee) for me to contact with.

Thanks