Just 3 posts in and we're already off-topic. Good old Shrivey.
I bought a cheapie no-brand UPS from a local electronics store, which protects our NAS and media server that are running in the cupboard (Harry Potter's Executive Studio under the Stairs).
It does the job, and another layer of protection is always good to have in the event of a surge.
Came included with software that runs on the media server, and automatically starts shutting down system after 90 seconds of running on battery power. It also makes a hell of a beeping noise when this happens, which scared the hell out of the cat.
I should probably look at getting another one to run my desktop PC through, but the server and NAS were the first priority. I'm not sure if a more expensive one would necessarily be worth it? No idea what extra features they might offer.