Those guys are very good and a great network. Also, I would suggest getting an outside admin to assist in any issues you do not understand and that are outside the scope of the suppliers managed services.
It's not as hard to do as it seems, especially if you're already using one of the big control panels (cPanel, DA, Plesk, etc). You can order a server that uses the same control panel and use it to manage virtually the entire server. If you don't get a fully managed server, have someone do some initial hardening for you, like rack911.com or a sysadmin friend.