[QUOTE]Seems that Cart66 is good if you are selling a very small number of things. [/QUOTE
I agree, the customer support ticket sent to them told me to try another cart if I was selling 1000+ products. Seems like it's geared towards selling digital products.
I bought Shopp recently and so far I'm happy with it. Presales questions sent were responded to immediately. After installing the plugin 4 pages are created for you automatically (store, checkout, etc) that integrate nicely with my studiopress theme. I'll update later after I get all my products set up.
This Shopp Questions and Answers
Video influenced my decision to buy.