What is the best cart for personalised goods?

looking for cart software for a project similar to tee shirt or print shop

[Faith]

Anyone have experience or recommendations for cart software used to produce personalized products where the customer can add their own message/slogan to each product? One that can overlay text over product image is even better but not crucial!

Thanks.

[incrediBILL]

I know ShopZone by AutomatedShops has product options of check boxes, radio buttons, list box selection and a text option where the customer can type in whatever they want.