gdrift,
while i have never heard an hk receiver, i have heard they are warm, which isn't the best for paradigm, that being said, if you have the cc370 as the center, then it is best to get the minimonitors so that you have timber matched speakers at the front, will sound alot better if they are all from the same company, maybe think about getting something like the titans or atoms to use as rears so that they all match, or another pair of minimonitors if you can afford it, just a suggestion. You would have to listen to the hk and paradigms to see if it is to your liking, both are great products, and maybe you will like the combo.
derek