Avalanche Solid at 2000 Abralon w/ Rough Buff
Street Rod Pearl
AMF Angle Reactive(great ball for the price, no suprises at the pin deck)
Hammer Razyr(amazing hit and carry)
Angle and Razyr are both 3 piece pancake cores, that will give you no suprises when the pins go down. Rapid Fire Pearl is a medium oil ball, it will not be able to handle dry lanes.
For you, being a low tracker and having medium speed, I'd suggest the Razyr the most, because it is a light-dry lane ball, that can be used on medium when you play right on top of the dry boards.
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My Arsenal:
Twisted Fury
Raw Hammer Pain
Blue Vibe