As someone else said, 2 locks. A heavy duty one attached to the rack at work, and a light one you you take with you in case you need to make an emergency 7-11/whatever stop. Maybe a 3 chain one if you're worried about your seat or something. And get some lockable skewers.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"