I know this sounds paranoid, but I use THREE locks on my DeRosa... I got the Evolution, the NY chain, and a Kryptonite U-lock. Plus, I lock my bike out in broad daylight, and I try to do it near an entrace of a building where they have security or a doorman. Finally, I always let the building know when I arrive and that I have my bike locked up outside their building. If they're inclined, they can take action if they see some idiot trying to pick my locks. It's not foolproof, but by the time the guy gets lock number 2 off, someone will have hopefully gone out there to shut the perp down.
Koffee