Another vote for Wordpress. I'll be honest and admit I've not tried many different blogs, just WP and Movable Type.
I found that Wordpress is easy to set up and use, its being constantly developed, and has a great level of support and plugins, making it very powerful. Its popularity is a testiment to its success, and I think its probably the leading blog software by now.
I think you are already doing the best thing possible, trying out all the different ones and making your own mind up
