I have 4 in the garage. But for me, the happiness is that it is heated, well-lit, and fully equipped. If I had just one bike in the garage I'd be just as happy.
What would make me ecstatic is if 3 of the 4 had FUEL INJECTION so I wouldnt have to periodically futz with them.
Every day I go out to the garage and pat my Vstrom on the seat.
2 motorcycles is a good number. One for all around hard surfaces like the strom and one for the rough stuff. maybe one more that's a little different say a triple or one that is in between the strom and what you have for the rough stuff. 3 motorcycles could work too. Lots of different combos could work.
A dirt bike, a combo bike (Vstrom) and a street bike (something stupid fast), add a cruiser or 5, would be perfect, but you can only own what you can afford (what the wife allows), and what your garage will accept.