All of Osirion's hosting plans are perfect e-commerce solutions.
The Business plan is the best recommendation, as you get a free dedicated SSL, free dedicated IP address, and it allows shopping carts and payment gateways.
Baby plans and higher allow for SSL certificates, shopping carts and payment gateways. (The Hatchling plan does NOT allow for SSL and multiple domains, which makes it less suitable for ecommerce sites.)
All plans allow shopping carts and payment gateways.
