My current benchmark ball is a Radical Guru Supreme drilled 42 x 4" x 32 (4"x4"x2") with a 4000-grit surface (neaT pad). This ball gives me the board I'm playing, a board to the right in recovery, and a board to the left in hold on many local patterns. Most importantly, it gives me a good read regarding the conditioner pattern and lane topography. If I need more back end reaction, I go to a Radical Guru drilled 60 x 5" x 30 (pin over bridge), also with a 4000-grit neaT surface. With strong back ends, I go to a Radical Score, drilled 30 x 5.25" x 60 (pin under middle finger with mass bias close to the VAL), also with a 4000-grit neaT surface. For light and/or short patterns, I go to a Radical Rack Attack Pearl with the pin in the middle finger and the CG just right of the grip centerline, with a factory finish (500/compound/polish). When I need more surface, I can go to an Ebonite GameBreaker 2, pin over bridge, CG right on grip center, with factory 500/2000 surface. When I need a different shot shape for carry, I can go to a Storm Lock, drilled 50 x 4" x 35 with a 2500 grit neAt surface. The emphasis here is that I start with the Guru Supreme in practice and move to a different ball, if necessary, based on the read I get from the GS. For many local patterns, the GS works well for me.