Lefty,
In my reply I was referring to the pink/purple Karma pearl. I thought of it as a Danger Zone reaction, but more colorful. It does have Activator Plus coverstock, which is a personal favorite of mine.
As far as the Ringers, each of mine has been stronger than their price point would indicate. My blue sold with polish is as strong on THS as anything with an exceptional midlane and finish. It's still a smooth reaction, just strong. The Platinum is the longest through the heads of the three.
We all bowl on such a wide range of conditions, not to mention bowler styles, that we'll see some differences from one guy to the next. I'm a huge fan of the Ringer line because of their exceptional value to the average bowler on the conditions they mostly see.