It appears the original quote includes the RAID controller, which works nicely with the hot-swap drives; you can insert a spare drive, identify it as a hot spare, and if there is a failure within one of the disk sets, the drive get grabbed by the controller and starts getting rebuilt into the array - on the fly.
Tape backup and SinMatic - Just say NO.
I can't remember off hand if the cap on Foundation is 15 or 20 connections to the share, but that is what DQ'd it for a client, as they were already within 1-2 users of the ceiling, then you need a new server OS - no upgrade path.
Another thing to consider in all this is an inexpensive NAS server, and if you don't have it already, a layer 2 (or better) GiG switch. Use the NAS server as near-disk backup, as well as taking images of all your desktop/laptop client machines so that you can restore/reformat/replace a client machine more quickly from a full-disk backup/clone.
If you're having a Topgun performance moment, you can get a 128G Solid State Drive (SSD) for your server OS, paging file, and AC drive partition. [I feel the need .... the need for speed].
