Another vote for Slammers.
If you fish skirted grubs, save them after the rock bass tear the twister tails off. The body/skirt makes a great dropshot bait rigged with the skirt out like a small, solid bodied tube. Yamamoto sells them as "Ikas". A couple of my other favourites are Pro Senkos and Jacks worms (one of the best kept secrets for smallies).
On many of our lakes, a shakey head will catch fish head-to-head with a dropshot rig. It's much easier to rig, and much easier to fish. Occasionally the dropshot will catch more fish, but not that often. All the baits mentioned so far work for both presentations.