Ask Slashdot: Anti-Theft Products For the Over-Equipped Household?

First time accepted submitter Dufflepod (3656815) writes "After yet another hardware purchase last week, I realized with some alarm just how drastically an enterprising burglar could increase the crapulence quotient of my life if they ever made off with my hardware. The house is alarmed, but much to my annoyance it isn't always set when people go out for any length of time. Ideally I want to 'alarm' the expensive items among my various PCs, UPS, NAS box, test equipment, and some of the sundry other gadgets & gizmos I require to stroke my inner geek. Over the past few days I have spent hours Googling for every combination of "anti-theft perimeter alarm radius motion detector vibration wireless" etc etc.. I have found various possible solutions, though the cost of some of them does make my eyes water (eg SonicShock @ €150/box). Has anyone out there decided to bite-the-bullet and protect their kit with decent alarms, and do you have any suggested 'do's & don'ts'?" So how would you secure valuable items, as opposed to securing the entire place?