The first thing that came off the top of my head was the Sure Thing core, its only a .043 dif but after reading about the Wisdom, that wouldnt be a bad choice either (never threw one but the Sure Thing is GREAT).....i was thinking the Lunatic/Jewel core but the diff is a little higher then the ones already discuss
after looking at some of the older stuff, the Creature core seems ideal too, little lower RG then that of the Wisdom but still see it work in urethane