that is not to many printers, and not exactly alot of people.
I would recommend going with a server that has 4 cores, 8 Gigs of RAM, and some sort of RAID system since you are going to store data. This really is kind of excessive for what you are doing, but always plan for the future!
I would have the OS on a RAID 1, and the data in a RAID 5. Configured with SAS/SCSI drives if you can... But they are a little more expensive.
I guess the next question would be: are you looking to go rack mount or something that will sit on the floor? And what is your budget?
I would also suggest surfing HP's site, they have a lot of options, and from what I have seen (lately) they make a better product than the Dell servers. Also, they seem to last longer and have a better bang (performance wise) for the buck (even if they say they have the same hardware).
**If you go with a rack mount, its going to cost a little more... just something to think about.