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ClickCartPro is nice, you may need some help getting it installed.
Also getting ready to install X-Cart on a site.
A lot will depend on your hosting set-up, your level of comfort installing/tweaking things, and your specific requirements for the cart.
Actually, once you get the hang of it, Agora is easy to customize - steep learning curve, though.
Depending on your need, a paypal shopping cart is pretty easy.