online clothing store

I need someone to build my online shopping site. I have an existing site for our retail business, but we are going to begin selling clothing online. It is womens upscale fashions so I want it to look nice, be VERY easy to navigate, load quickly (image optimization) and sell lots of my products! ;-) I have installed OScommerce, Zencart and X-cart on my own and have built regular html sites before, but i just dont have the know how to build the ecommerce site. I am leaning toward OScommerce because it seems to offer more features. This once the site is built I have enough knowledge to maintain it. I would also like some regular pages that will not be hard for me to update with other things besides ecommerce, like store news, events, photos, etc....