Nice !
I am big on cycling as well. During this time a year, I do about 200 km a week on my roadbike (typically 4 x 50 km).
I was also recently introduced to MTB and going over trails and such. I have not had a lot of experience with that yet, but it has been pretty cool so far. Been to 2 different countries to do some tracks but I pretty much suck at it (it has pretty much nothing to do with the roadbike in terms of technique, though the leg strength does help).
I own 4 different bikes.
-One winter/city roadbike that is a Trek (Tiagra groupset, aluminium frame). I use this for all kinds of things.
-One training roadbike that is a Koga miyata (Ultegra groupset, carbon frame). This one I only use for fast rides (I never leave it anywhere. This thing is my baby).
-One old school Koga Miyata roabike (steel) from 1986. The cool thing is that it has all the original parts (except for those that wear and have to be replaced), and there is barely a scratch on the original paint. It is a cool bright blue that really stands out (looks like it could have been painted yesterday).
-One crummy crap bike that I leave in front of bars and at the train station overnight. This is the "I wont care if it gets stolen" bike. (though it is my second-most used one
)
I am planning on buying a MTB as well. I have been renting them and that gets pretty expensive fast. The sooner I buy one for myself the better.
But that is not all. Of course there are different wheels, different kinds of equipment you can buy and so on. As a money sink I find cycling far worse than keyboards. "How far down does the rabbit hole go?" is a question that you start asking yourself there as well. It happens around that time when you are about to order two carbon waterbottles for $50 each...