If you can still find it, the Nomad Dagger is a good choice. Being a hybrid, you get a little extra length but the solid balances out the strong snap. For me, it's very clean up front, reads the mids well, and has a controlled reaction on the backend. I've used this under my recently sold Anarchy and love the predictability. Hands down, a very solid choice.
One ball that I just picked up is the Hammer Brick. This can be drilled to fit beneath the Anarchy and it is flat out a beast. It's very similar to the Nomad Dagger, but allows additional options with drilling since it has a completely asymmetrical core. Unlike the Dagger, the Brick can handle heavier volume, giving you more flexibility. I've only thrown a few games with it so far but my thoughts are that its very clean up front with its hybrid cover, great with the mids and just destroys the rack with hitting power. It's also very predictable. Absolutely a great ball to consider.
My Arsenal (as of February 2012)Heavy Oil: Roto Grip Defiant: 2000 ABMedium-Heavy Oil: Track 919C: 3000 ABMedium-Heavy Oil: Ebonite Vital Energy: 4000 ABMedium Oil: Hammer Brick: 2000 polishedMedium-Light Oil: Track 505T: 4000 AB