One of the HK pistols I have never really given thought to. Can someone explain to me why some go for $600 and others go for over $1,000+? I am very familiar with P7's, etc. I know the .45 is more sought after, but what about the 9mm? There is the combat, the target, anything else? I have seen a couple in my local gun store for around $600 (9mm) and wondered if this was a decent deal. They also have an HK4 with .32 and .22 for $550.