Pair.com also offers accounts with Miva Merchant functionality.
Internet Media Provider
I've tried using other "cookie-cutter" shopping carts that just ask you to input items/configs and * poof! * a shopping cart is spit out the other end. These carts are the easiest to setup, but lack asthetics.
From my simple research, miva appears to pretty much be the backend programming and all I have to do is setup the products on the server. Then create my pages and include different links to the products already configured, right? Could you please explain, in reasonable detail what the process is and how lengthy/problematic it can be. I'm planning on starting off with 50 products and moving to 75 soon thereafter.