I have a cheap lock from a big box store - you could very easily cut through it with bolt cutters. I'd like to get a better lock but I've just recently started commuting and have some other things I need to buy first (a better light, panniers, etc.) Based on my situation, do you think I need to get a new lock right away, or can it wait a bit?

For background, pretty much the only place I ride is to work. I work for a large corporation and our building is out in a rural suburb, where I park my bike in the parking garage next to my building. It's very unlikely for someone who walks past my bike to be other than an employee of my company. We're in the financial industry so people there are pretty well background-checked, although maybe I'm putting too much faith in humanity.