As an avid hunter, shooter, and beginning gun collector, I support the amendment. I don't honestly see a problem with trustworthy civilians being able to own automatic weapons either. It's been beaten to death though, and I'm pretty sure much of what I wanted to say has already been said, so I'll leave it at this:
After WWII, a prominent Japanese Admiral was being questioned. During the questioning, he was asked why the Japanese didn't invade America proper after their attack on Pearl Harbor. The Admiral, before going in to specifics on tactics, laughed out loud and said, "We would have to be crazy to launch an assault on a country whose citizens are as heavily armed as its military."
Whether the story is true or not (I can't remember where I found it, either a book or a website somewhere), it illustrates a point; before the invention of the Atomic Bomb, it would be crazy to invade America because you would not only be facing a well armed and organized military, but also a well armed and near-fanatical civilian base. It would be an army of a couple hundred thousand at the very most versus an army of similar sized plus a militia numbering in the millions. Suicide. And, in truth, the invention of atomic weapons hasn't changed that fact much, simply due to M.A.D.; any use of nuclear weaponry will likely result in a nuclear response, which would devastate the world. The only logical course of action would be a ground invasion, and if that were to happen, again, it would be a force of a few hundred thousand at the very most versus a similar force plus an extremely large militia. Again, suicide.