Any of the high performance cylinders and beaters out there will give you a performance increase. I prefer the PF Parts because of the bar design, low maintenance cost, and ease of service. Whatever one you choose, make sure that you speed up the beater. The PF 60% kit is best because it matches the cylinder and beater speeds best.
The thing about the sunny beater that worries me the most is the pegs between the paddles. I would be concerned about these causing material to wrap. Have heard of some guys cutting them off.