I would bring back the Mystic, (great Particle Pearl ball) and the Cell (great Solid Reactive) and hope that it would not crack! LOL!! I had both of these peices and I loved them both! One ball that I did not have but I think that I would really love would be the Fuel peice!
Mr_Smooth
"I can now make the 10 pin, I have an In-Viz-A-Ball Spare ball"