I've cycled through a lot of WordPress e-commerce plugins, but I've settled on wpStoreCart after the amazing support I received from their team (or is it just one person, I'm not sure but I read other reviews where they say it's just one guy.)
Anyway, this plugin is amazing. It's definitely got the best admin panel of any plugin I've ever seen. It's all ajax editing everywhere, the tables with the order data is awesome, and the number of settings is impressive.
I had to leave this review after looking at all the negative reviews this amazing plugin has received. I encourage everyone to try this plugin for themselves. You won't be disappointed.