Welcome to the forum. You have embarked on the Red & Black road. It's a long journey and along the way your will empty you wallet. But you end up with a nice collection of HK firearms.
And with that in mind, not sure of your age (not my business) but patience and living a long healthy happy life means that you have the time to expand your collection to your liking in the coming decades. The laws change (recently not for the better) and time has a tendency to level the playing field, if you know what I mean.
Again, welcome to the HK Enablers forum.