In the UFC it would have to be Liddel, Monson, and Arvloski. Monson could just bull rush people with Arvloski swinging behind him, and Liddel picking people apart from afar and cleaning up a soon as someone falters.
In Pride it would have to be Fedor, Cro Cop, and Randleman for almost the smae reasons. Randleman's take downs, Cro Cop's kicks and precision, and Fedor's......well everything. The only thing I haven't seen Fedor do is throw a spinning back fist or kick, flying knee, or superman punch. The guy is utterlying dominating.