Never heard of them.
Do you NEED a dedicated server? That's really something that will need to be determined. Saying that you have an ecommerce site doesn't automatically mean you need a dedicated server. *IF* you got a dedicated server, you'll be paying around $150 for the server - $50 for management - $30-50 for server backup solution - and various other tasks and/or fees to secure the server.
If you're only starting out, a decent host that has experience in eCommerce would be a good start. Determining what software you're using for the eCommerce can also determine which host is a good fit.
What are your hosting needs? How much bandwidth do you need? How many visitors? What type of software are you using? What is your budget?