Suggestions for spam-fighting plugins?

Hey guys,

Lately I have been getting a lot of span comments on my blog from ViagraBots and PokerBots. I’m sure you guys have had the same problem. After failing to solve the problem with the few spam-fighting plugins I tried, I was wondering what you guys use? It’s easy to get overwhelmed when looking for the perfect plugin. I would prefer not to have an image letter conformation, but if that’s the best way, I’m willing to go that route. Do you guys have any suggestions?

Thanks in advance. Together we can annihilate spam from our blogs!