Very nice, is that titanium? A second set of wheels is a great idea. Disc brakes make it easier, in the past with rim brakes you had to be careful to get rims of identical size. I recommend some 28C or 25C slicks for the road, this will make your bike as fast in real life as a proper road bike. Not especially cheap, £200-300 minimum, but worth it and cheaper than a second bike of the same quality.