I was hoping to purchase a power meter in the near future as I have come to realize that it is the best way to train for the sport. I have looked at the Quarq, SRM, and powertap. I was wondering if there were others out there that I should look at that is compatible with Campy components. I was hoping to find something that was crank based so I would not have to rebuild my rear wheel like with the Powertap. I know that the SRMs are nice, but they are also very expensive. Thanks for the help.