No one does any PVP anymore in FFXI as far as I can tell.

Personally I always liked Brenner... but I never ever ever got to try Ballista.

I love love love love Pancraton. I really wish they would extend shouts to the Colosseum zone so I could fiddle with it while waiting for something interesting to happen... then again I gave up on answering shouts some time ago so.. que sera sera