I think the PG Blues would be perfect, or an Alnico II Stormy Monday set. You can get a LOT of grind out of the Stormy Monday. I think that the Riff Raff might have too much high freq energy for your taste, as I read in another thread, a fizzy top end is not to your liking. Not that the Riff Raff is fizzy (No BKs are), but with the wrong amp combination it could be really, really, really bright.
That being said, I've been playing my Riff Raff/Stormy Monday LP clone exclusively the past 2 months. :)