I've got a U-lock from the mid 90's, when they first starting getting popular. It has a Trek label on it (got it with my Trek 720 way back then). Its one of the versions that has the circular key - the kind a bic pen can fit into. I honestly haven't used it since probably the late 90's, and I literally just got back into biking and had my mom send it to me from home.
Now I'm not so sure I want to even bother using it. Especially after watching some videos on Youtube.
Thankfully I park my bike in my classroom closet at school, so it's not a total issue - yet.

I guess my question is - what specific u-lock and cables with locks would you recommend?