RuAmL, Shane, then Rod
Naw, I wouldn't consider Ruaml being a premier smack talker, most of his insults and smack talk was of the 6th grade playground level and never went beyond that. Besides, as soon as he started to talk smack he was easy to get to shut up, either shoot him down (which wasn't hard at all) or just call him RuPaul. He'd look for other targets after that, or just shut up.
Shane, was good.
Rod...well, he's like Ruaml, not original, witty, or funny and often resorts to 6th grade taunts or vulgarity.
ack-ack