Finding a good online shopping cart and payment gateway is hard.
Many of my readers tackle this and similar issues on a daily basis as they
deploy sales and marketing solutions for their customers. A former colleague and
friend of mine is particularly passionate about online shopping carts. Recently
he revamped his review site:
shopping-cart-reviews.com. One feature I particularly like is that examples
of each cart in action are provided.
If you or one of your clients are every in the market for cart/gateway - then
definitely stop by his site
for tips & tricks, reviews and a comprehensive listing of carts.