We're in the process of building a simple 10 page site with 7 products. Want to integrate a shopping cart to allow e-commerce. Need cart contents to show on banner (top of each page) plus all 'add to cart' and checkout functionality. We already have a merchant account, etc., just need real-time ccard processing through the shopping cart. Having paypal and/or google checkout would be nice if you have experience with them. Thanks!