OK, I only keep the bikes I think are the most fun to ride. But with that caveat, there are two that kind of come to mind at the moment.
First, my Holdsworth Professional has been outfitted to be light, quick, convenient transportation at my office. I can jump on, even if I'm in suit and tie, and zip down to grab a bite to eat or even make short errands.
Second, the International I wrapped up work on a while back is really comfy and makes for great riding with my wife (who doesn't relish the long rides that I do.)