Recommend a simple cart for existing site

[dpd1]

Just looking for recommendations. I'm helping somebody with a small site. She just uses PayPal now and the site is completely built. I'm wondering which cart may be the best option for her. She basically just needs something simple, but better than the crappy built-in PP cart. ie: Something that has better shipping rate calculation and some other features. But it doesn't have to be outrageous. She wouldn't be able to figure something out that's too complex... It needs to be something where she can just create buttons, then add them to the site html... and the user interface is easy to understand. Some that I've looked at that seem pretty decent are: phpCart, Mal's eCommerce and ShopSite.

Thanks

[dpd1]

In case somebody is looking for something similar someday... Decided to go with SecureNetShop. So far it seems good, especially if you're a PayPal only setup. You can set it up to be configured as "Express Checkout" through the PP API permissions, so the cart empties directly into PP. So there isn't extra confusing parts or having to fill out info twice or anything, during checkout. You can also put a custom text message on the cart, explaining that you can still use a card through PP. Online support people actually seem pretty intelligent.