I’d like to quickly mention that I personally use WordPress and b2evolution for my blogging needs.
In fact I’ll be moving away from b2evolution on my other sites and into WordPress, since I find the SPAM filters in WordPress to be far superior. Blog SPAM is as much of an issue as it is for normal email. So any software that handles it better will put you ahead from the start.
Customising WordPress is straightforward and simple, and the admin area is very easy to use. I can see why after installing and customising a couple of WordPress blogs it has grown so fast among the blogging community.
We have several blogs in our installable scripts area that you can install and try out.