I just bought the Kryptonite New York Fahgettaboutit 1415 Chain Bicycle Lock with New York Disc 5 Lock . I lock it at my school where Cameras are, the thing weighs 15 lbs. It'll def takes some time to break into. The lock it self can be used to lock the disk. paid 94 bucks from amazon. shipping was free!
Comes with 3 keys, 1 with a LED light on it, its blue and useless. its a 12 on their security scale.