Biggest I've thrown lately has been a Storm Dark Thunder Pearl. I'm surprised more Storm/Roto stuff hasn't gotten mentioned here because that company has always been skid-snappish by default.
Surprisingly enough, a Lane #1 ball (Supernova XP) is in my top five, weird because that's a company that has traditionally defined heavy roll rather than skid/flip.
Generally speaking, I would look at Storm/Roto-Grip first, Ebonite-poured stuff second (which would include the Hammer line), but the newer stuff from the folks at 900Global is starting to get my attention, too.
Jess