Cart install & set up needed for pre-existing Wordpress site

This is what a business in United States was looking for in their Wordpress design

Wordpress 3.2.1 (www.daoistgate.com) needs a shopping cart. Here is what we need your help with:

-Deleting current half installed cart
-Install of the new cart
-Minor customization to match look & feel
-Adding products (less than 25)
-Helping configure shipping (USPS by weight) & payment gateways

We are OK with using a paid cart if it performs better.
We need this completed within a week.

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