Simple Site Using Free Shopping Cart System

I'd like to create a simple gift baskets retail website using a free shopping cart system like zencart, open cart, etc. I've already installed zencart but was displeased with the checkout process, particularly that it doesn't have 'guest checkout'. I began exploring other systems such as open cart, but didn't like some of the other features/templates. Basically, what I want is a very simple site similar to [login to view URL], [login to view URL], [login to view URL] a very simple checkout process. Because I don't want to spend a lot of money initially, I want to use a free shopping cart system with perhaps a modified free/cheap template. Please send me your recommendations on how you will complete the project. Price is very important to me.