My wife and I are in pretty good shape. Running is getting too hard on our joints (not that we are old). We both enjoy bicycling very much. We both know that they can get very expensive. Before we go there, we want to see how much use they will get. I have no idea where to start. My wife would like to find some sort of hybrid. We will be riding on the roads a little, bicycle paths mostly, and maybe some light trail riding. Any advice or guidance would be appreciated?