If you haven't seen it you might want to check out the Continuous Integration Feature Matrix which lists virtually ever CI server out there.
I work on the Java version of CruiseControl and these days I work for Urbancode who makes AnthillPro. From that perspective the right tool depends on the scope of what you're looking for. If you're just looking for fast feedback after a build lots of tools will work. If you're looking to setup a build grid then a there's a smaller group of tools. If you want to track dependencies between projects and deployments to multiple environments then you're in an even smaller group.
