A professional website

General information for the website: I will be selling various African ethnic items - clothes, shoes, giftware, homeware, office decor. I currently have a selection of several items which I want to upload, provide about 4 photos per item with zoom tool and specification. I want customers to be able to use PayPal for payment.
Kind of development: Customization of existing website
Description of requirements/features: SEO

Social media marketing

Customer sign-up and CRM functionalities

Each item would have a short description, dimension, uses - where applicable, etc.

Some items are the same but in different colours and sizes. I would want to list them together with the option of clicking on the colour option to give the full picture in that colour. Please click on this link for an example:

http://www.marksandspencer.com/Collection-Cotton-V-Neck-Stitch-Jumper/dp/B0043GFI7M?ie=UTF8&ref=sr_1_1&nodeId=43078030&sr=1-1&qid=1390564882&pf_rd_r=1W224550G2ZK634SW1EX&pf_rd_m=A2BO0OYVBKIQJM&pf_rd_t=101&pf_rd_i=43078030&pf_rd_p=321381387&pf_rd_s=related-items-3

I would like upselling (You might also like to buy) to increase sales.

Search functions.
CMS and Admin requirements: I would like to be able to update and manage the content myself upon completion of building the website.
Extra notes: I need someone who is highly responsive, flexible and creative.