I would say to go for it if you need another display and/or want something that small.
Another thing about which to think is that you may be able to grab the 12-inch monochrome monitor which offers the slightly more generous 640x480 resolution, and also underside cable wrappers, which would make the 12-inch mono display super great if you wanted or needed a monitor to take with you for whatever reason.
I've had a 12-inch before (May still have it, not 100% sure) and it works great, especially, as you said, for a server, I had it hooked up to my PowerMac 7300 for awhile, so I could look at what was going on with ASIP/MacHTTP
Another thing about which to think is that you may be able to grab the 12-inch monochrome monitor which offers the slightly more generous 640x480 resolution, and also underside cable wrappers, which would make the 12-inch mono display super great if you wanted or needed a monitor to take with you for whatever reason.
I've had a 12-inch before (May still have it, not 100% sure) and it works great, especially, as you said, for a server, I had it hooked up to my PowerMac 7300 for awhile, so I could look at what was going on with ASIP/MacHTTP