What is the best shopping cart?

I've been doing a lot of research on shopping carts. I have reviewed the following:

Shopping Cart Creator (CoffeeCup)
ZenCart (open source)
CubeCart (CubeCart)


These are my assessments:

Shopping Cart Creator (horrid customer service, no refunds, PayPal function did not work, despite my meeting all requirements and having paid for the pro version)

ZenCart (great for open source, more complex than some to configure from a web designer's standpoint)

CubeCart (I really like this one, although it's not free...$179 on the high end. Also it appears to send emails even for orders not completed...there may be a way to turn it off.)


Alternatively, there are many other carts to choose from and even some that host and perform all cart functions elsewhere.

Activa (Active Media Architects)
eMartCart (eMartSolutions)
Volusion (Volusion Inc.)

...of those, I liked how Activa integrates with a site, such that it doesn't appear to be a separate function. I can't speak for the price. Volusion looked like a close contender. eMartCart is also appealing, primarily due to its price point.


Have any of you had good/bad experiences with shopping carts and can relay helpful info to the rest of us? Feel free to drop me a line at contact@guardpostonline.com