Firestats is a Wordpress plugin which is great for comprehensive stats that include crawlers, etc.
Google Analytics has plenty of plugins and if you've used it you'll know its strengths and weaknesses. If not, it's good if you're all about driving and improving traffic and ads, but not that great if you're just curious about your traffic.
The built in Wordpress blog stats aren't bad actually, try them out.
Finally I use extremetracking.com for geographical, and just a nice quick way to get a snapshot of usage.
That being said Google Analytics is the best software hands down. They provide more information than any other product I've seen.
I'm actually running both right now and actually like the information I receive from each.
Mint gives me a "what's going on now" view and Google gives me a "what's going on overall" view.