Vicki,
Unless you are so inclined as to build your own server as Sandeep suggests, you simply can't go wrong with any of the Dell T410 through T710 series. I still recommend the T610, which is the basic equivalent of the the workhorse Dell 2900 Edge.
You could even pick out the hard drives and have them configure the RAID with an SBS 2011 Standard. Of course, RAID isn't that hard to set up with a hardware controller as long as you know how to load the driver. Of course that means not having the server installed.
Contrary to what Sandeep will tell you, if you don't have good IT, I would have someone set up the client/server domain for you.
