Add e-commerce functionality to a website (wordpress?)

Hi,

I have a client who wants an ecommerce website with full CMS.

I am a web designer and I have experience in building wordpress themes, so this is the obvious CMS of choice for me, however, I have not been successful with any of the shopping cart plugins I have found, so I am seeking help for this part.

The functionality we need:

1. Product pages which are easy to add, delete and amend using the CMS.
2. Shipping calculations by weight, and with 2 shipping zones (UK / Ireland only)
3. Only 1 currency (Stirling).
4. 2 payments offered to the customer (Paypal & Nochex).
5. *Maybe* customer registration to retain their details.
6. 'Confirmation of order' screen AND automated 'confirmation email.

To summarise:
*I am thinking that I will design and setup the wordpress site. I will do all CSS development. You, will implement a suitable plugin to to provide all functionality listed above.

** I will also consider any bids to do the site in its entirety. The client has colours, logo, font and some sketches of rough layout for all the pages.

*** I will also consider quotes for a system other than wordpress, providing the CMS will be available for the clients to change content and for me to change page templates and CSS.

It would be great if I can find a developer I can work with longterm. I imagine UK based freelancers will be more suitable, proficiency in English is essential.

So I know you've read the description properly, please begin your bid with
"I can build you a shopping basket"

Thanks very much.