If you're talking about trips in addition to the commute to the office, the considerations really depend on the location. The sturdier the lock the better, but in many cases, a superior lock out of view could be considered worse security than a lesser lock with more eyes on.
You'd be well-advised to secure, in addition to the frame, components like wheels and seat, especially if they're quick release. For that, a lighter cable (maybe even one with a built-in combo lock) might suffice as deterrent, but again, it depends. Some of our opportunistic friends seem to be more interested in wheels than frames.
If you have the inclination, a proper, heavy chain is better than a D-lock - both should be impervious to bolt-cutters, but a D-lock can be forced open/broken with a jack and a chain usually cannot. Also a chain is more difficult to cut with an angle grinder as it moves about and might break the cutting disk.