What is the one ball that either you bought or went back to that has saved your season to this point?

For me, it is the Scorpion.  I started the season after having not bowled competitively for 5 years, with the same balls I had when I had to go on a hiatus.  I had a Beast, Messenger, Deep Freeze, GB2 Solid, GB2 Gold, and Violent Eruption.  In Atlanta, where I am from, I matched up really well on the league conditions with the Deep Freeze and Violent Eruption.  When I moved to Florida and got back into league; after 6 weeks I quickly realized that the conditions down here did not lend me to match up well with those same balls as I encountered carry down I had not seen before.  I was averaging 230+ before the move and after 6 weeks in the new surroundings, I was averaging only 209 because I could not stay away from 2-8-10s.  I decided to get a Scorpion and it has saved my season.  In 4 short weeks; my season average jumped from 209 to 220 and currently sit at 221 while averaging 235 with it.  Scorpion is very versatile in that I can tighten my angles and play a little straighter (12-13 arrows to 7-8 breakpoint) or, as I did last night, was able to float the ball paying 20-22 at the arrows and still able to kick out the 10 pin even with the surface at box finish (2000 no polish).

The Scorpion is the one ball for me that has rejuvenated my season.  So which is the one ball that has done the same for you?