most full featured shop cart for wordpress

I started off using this plugin and used it for about 2 years. it served my needs very well for the time and it does everything it says. I just recently upgraded to the pro version, only 29 dollars, and it literally turns your website in to a real online credible store. with both the free version and the pro version able to use paypal, and Mijireh, for real actual credit card processing, once you have this shop cart, say good bye to child like check outs. I use this cart at http://commtechusa.net to sell my consulting services, computers, cellphones and manage my entire online inventory.