The ZipZaps cars from eBay, Etc. do not have extra motors or gears. You only get enough stuff for one car, no extra parts. For extra motors you need one of the booster kits or you might want to take advantage of monkeyballers offer of a pinion gear and fix what you have.
The SE series of ZipZaps have semi proportional speed and steering control that is a big advantage over the one speed and full right/left steering on the Transformers. SE's also have 6 selectable control frequencies so you can race up to 6 cars at a time. I don't have any early ZipZaps (non SE's) or Pixars but I think they are about the same as Transformers.
Just out of nosiness, how did you break the pinion gear? It's pretty well protected from normal abuse.
As far as collecting hair they are all about the same and all are a PITA to de-fur.
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