Retro Resurrection. You can still find them in some places. Very predictable, and very versatile ball.
I have a Winning Streak, which is analogous to a Silver Streak Pearl (the Winning Streak is an overseas ball). It's a great change-of-direction piece when you need something to attack from an angle.
I also have an Ultimate Streak (overseas Silver Streak Particle) that I haven't thrown yet, but the Streaks and the Retro have virtually identical cores, so I've got a good idea of what to expect.
The only Roto I have that I can't figure out is my Silver Streak SE. I really liked it when I first got it, but it's since become too over/under for my tastes -- mostly over. Basically, I think it's just too strong for a lot of THS patterns.
The Retro is a complete winner, though.
Jess