Right now, your best bet would be the Raptor Talon and Jackal. The Talon is a very early rolling ball while the Jackal will be cleaner through the front part of the lane with a strong midlane reaction. Since the Talon is most likely discontinued I would keep an eye on what Motiv may come out with in August/September. Since they have the new Tank out next month and a rumored Primal ball in July, it'll probably be a few months before we see a new heavy oil ball.