Way off topic - Shopping Cart opinions

Ok, we're considering changing the shopping cart that we currently use for our auto body repair clip business from Go Daddy's Quick Shopping Cart to something better.  So I've got two questions for any of you:
 
1)  Do you personally use one for an online store and would be willing to say which one with your opinion of it?
 
-OR-
 
2)  Are there any online stores that you have bought something from where you thought the whole experience from selection to purchase was really good?
 
TIA!