Some of my favorites . . . .
Solid (Heavy Oil) - Storm Nano or RG Theory (IMHO, good balls but burns up oil quickly forcing you to change your line frequently)
Hybrid (Medium-Heavy Oil) - RG Infinite Theory (snappy) or Storm HY-Road (arcy - my benchmark ball)
Pearl (Medium) - Victory Road (snappy) - awesome back end for a symmetric core
Pearl (Medium-Dry) - RG Rising Star (can be too strong if drilled strong), RG Dark Star,
Except for the Nano and Theory, I am biased to the symmetric core balls as I seem to have more control with them. . .
Honorable mentions - RG Critical Theory (just released pearl with alot of back end getting alot of attention)
MK