Chances are, that if you're going to be a one car family (we've made the switch), that you're going to eventually be multi-bike guy (I am).

Get one from your list now. Ride it for a year. The points that others have made here on this thread are all valid except for one somewhat major detail. These people aren't you and a test ride is never going to tell you all you need to know. You don't state what your riding experience is, and if this is a new venture for you, you will discover issues that you would never have thought of in your wildest dreams.

I will say that there is one common mistake amongst people just getting started, they don't take into account where at work they are going to be able to keep their bikes. As I'm sure you have read by now on these boards, bike security is a serious consideration. It is extremely discouraging to start off on a life change like this, only to have your bike stolen. Even great locks don't necessarily mean that your bike is secure. If you're showing up with a new bike, assume that it will be a target.