This is going way, way back, but there used to be a poster named "sarcastro" who always cracked me up.
Otherwise, I enjoy the posters that actually talk about musical stuff - brennser, hoyasaxa, killsaly.
Over the last 10+ years, I have met an inordinate amount of posters in person. I have liked all of them. Even James Ford. As someone pointed out in another thread, RatBastard is actually one of the nicest guys you could ever meet, despite what anyone thinks of his politics. The internet isn't real life.