If this is you:
I offer a fair number of different products (20-200)
My products span various categories
My product information and pricing can change frequently
I can install custom code on my website
I have complete control over my website hosting and DNS
I have or can setup a merchant account

Then a simple shopping cart is probably the right solution for you! Contact us to arrange a free consultation on building an appropriately sized e-commerce solution using a simple shopping cart system.