Thanks everyone. I will probably stick with the cyclocross mainly because it seems more flexible. The reason I began considering road bikes was that the choices and availability were much greater (especially when searching for a used one). Bitterken mentioned that the newer road bikes, which is what I'm looking at, won't have clearance for tires larger than 25mm. That seems about right when you look at the brakes. I'd also like the ability to hop on/off a curb, or ride down a few stairs without worrying so much about messing up my wheelset.
I'm pretty comfortable on a true road bike, so I don't expect to have much trouble with the cyclocross geometry. I'm looking mostly at the Lemond Poprad and Felt F1X, but leaning towards the Poprad because of the steel frame. I know everybody likes the Cross-Check, but I just can't stand the look of it (shallow, I know)...