Here is what I have:

Track Rule GP2
Roto Silver Streak Pearl
Columbia Trooper

What am I missing?  I only want to have 4 bowling balls, but there is alot of gaps between the three I have.  The rule will hook on anything I put it on, the SS will move only if there is some backend, and when the lanes are dry, hit the urethane.  The SS will go pretty long, and when there is backend, it makes a nice turn into the pocket, not a BIG SNAP movement, just a nice hook.  I cant swing it though, seems to loose alot of energy when that happends even if the lanes are drying up.