Personally, if you can afford it, I would pick up two: either an Ultimate and Absolute or an Ultimate and Zone Classic. The Ultimate is a must, as it can serve as your heavy oil ball. The Absolute or Zone Classic will give you a bit more push then your Smash/R but will recover harder. I have both, and they are both awesome. For me, the ZC pushes about 5-6 feet further down the lane and recovers harder and with more snap. The Absolute starts up just a bit sooner and delivers a smooth, hard arc on the back. Both are great balls. Which one you choose will just depend on the look you want. Good luck and good bowling to you.

P.S. Be careful with the Ultimate. It's an extremely aggressive ball. You'll most likely have to put a good amount of polish on it unless you have very high ball speed or only intend to use it on floods. It's that strong. It's a great ball, though, one of the hardest hitting that I have in the bag.
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I can't bowl 300, but I can bench 340 : )

I have the Absolute and drilled it with the pin over bridge, cg below middle finger and I kept the ball in out of box condition. This ball reads all parts of the lane incredibly well and I think it's one of the best balls for telling you when it needs to go back in the bag. I've used it on short patterns, long patterns, wood lanes and synthetics and scored very well all around.

I would say if you are looking for versatility and best matchups for a variety of conditions, the Absolute would be your best bet. If you are looking for more of a flood ball, then go for the Ultimate Inferno.

Matt