I'M TOTALLY A COMMUNIST!! (joking, joking; don't kill me LOL.)
You did forget to include them though.
If I had to choose, I'd stay right where I am in democracy. Monarchies are okay. I've got nothing against them, per se. I DO have a small, teensy-weensy problem with the whole, "You have to be of royal blood to rule the country" concept, but it works! Plus, there's a parliament in place that is like a small democracy which keeps the monarch from going completely power mad. ^_^
I used to be an anarchist at one point in my life. Sometimes, I consider falling back in to that slot because I've got some issues with our own government. But for the most part, democracy works. If you wanna think on a larger scale, our country is kind of like half democracy and half plutocracy. Have you ever heard of a broke politician? Seriously! Most politicians have their hands in some type of business or trade that earns them some loot on the side and the politicians who've got their hands in large coorporations are the ones who are giving those big business tax breaks. There's no such thing as a broke CEO either... Unless you own Enron. LOL.