I recommend WP e-Commerce with Atahualpa
 

Just wanted to let anyone looking for an eCommerce plug-in that WP e-Commerce does work with Atahualpa. There is some configuring but with the support teams from BytesforAll along with GetShopped we were able to work thru them. Our site is doing exactly what my client was looking for. The tech support received from both of these great development teams was wonderful. Thank-you again, Jugglehead for all of your time and consideration. You helped me to get to the actual issues so that the GetShopped team could help with the rest. :) Great Theme! Great Plug-in!