Well the N80 tops out at 2.5 fps when doing servo tracking AF and the Elan 7 can manage 3.5 fps. I would say if you're concerned about motor drive speeds you should try and get a used EOS A2, it can do 5 fps in servo tracking AF. It's a semi-professional camera and can do everything you ask of it. The alternative would be to try and find a used Nikon N90s, which is basically the equivalent Nikon to the A2. Either one is going to be better at high fps shooting in tracking AF than the N80 or Elan 7 which are more consumer-oriented.

*edit* The N90s can do 4.3 fps in continuous-shooting AF tracking shooting