Depends on how much oil you're looking at.  For medium-heavy, the Impulse Zone, maybe the Nemesis.  For more legit mediums, the Ambush.  For lighter oil, the Dry/R or Urethane Groove.  For very heavy, pretty much everything's going to be smooth, but the Scorchin' or Ultimate would probably work well.

The ZC is supposed to be pretty angular, but it would really depend heavily on the drill pattern since it's an asymmetric.

SH