As you want to replace 3 bikes with one you'll need to think about certain "must haves" features from each one, you won't fnd a bike that does everything your road, hybrid and mountain bike does but you can certainly find one that does most things, a cyclo cross bike covers most bases. Personally if I was in a similar situation my thought process would be after deciding a cyclocross format frame:-
Road bike properties- light, takes thin tyres.Gearing for fast progress on tarmac
Hybrid bike properties- versatile, takes guards and rack. Robust, reliable and easy maintenance.
Mountain bike properties - takes thick tyres, wide MTB gear selection ranges for climbs
The 13 alpha looks ok, but it's not overly light and because it has one of the lowest groupsets the gear range isn't that wide either. Start with a decent light frame and carbon fork. Most other things can be upgraded in due time.