As everyone else has said, there is simply no substitute for trying a variety of bows before you decide. There are just too many personal factors in terms of fit, preference, etc.
Are you looking for something that is the same/similar length as the K-Mag? Because that will narrow your options. There aren't that many production bows that are only 52." If you are open to longer bows, even just 4-6" longer, you'll have a lot more to choose from.
But despite owning other bows, I agree with you. My '70 K-Mag has a special place in my small collection.