Ask the center what their typical condition is, and when they condition. As far as complimenting the BWP, the Rival will be far more different from the ball you already have. The Venom and Pearl are not that different at all.
_________________________
The Ball Bag:
RotoGrip Cell 1000 Abralon
Columbia 300 Momentum Swing OOB
Columbia 300 Momentum OOB
900 Global Break Pearl 2000 "Sauced"
Columbia White Dot
2008 Osan AB Singles Champion
HG: 299 (a 7 pin)
HS: 755