I am worried about ANY bike I own being broken down and parts of it stolen. To that end, I have the Kryptonite chain with the Multilock padlock on one part of the bike, and the OnGuard u-lock on the other end of my bike. The wheels are always locked with the frame to some solid, nonmoving surface, and if I'm in a real bad part of town, I have a third chain with another multilock padlock that will loop around everything. Rarely do I use that third lock, though.
Koffee