Best PayPal only e-commerce alternative?

I am setting up a site for someone who only has a few products at this time, and doesn't have a merchant account (just PayPal). They don't have advanced computer skills - I don't want to set them up with something and then have it be impossible for them to add products later. I am thinking that PayPal buttons would be the best option at this time til they grow to need something more complicated.

I have been going through the lists of e-commerce plug ins over and over, and it's difficult to get a handle for how easy or difficult they are to manage on an ongoing basis without downloading and testing each one of them which I would rather not do.

Here is a nice list of e-commerce solutions I found-
http://speckyboy.com/2008/10/23/10-p...for-wordpress/

If anyone has comments about any of these, I would love to hear them!