I'm wondering if there is a wireless bike computer out there that can measure speed, cadence, distance, and HR over time and export that data to a computer? I have an iPhone I use to track my rides with GPS, so if I could somehow link the data of the two devices, I'd be golden. I see the sigma 9.1, but that's a little pricey. Any suggestions or does anyone know if it is possible to link the two types of data? Should I just be saving to get a garmin? Fwiw, I don't want to get the wahoo type thing that would turn my phone into a full blown computer, I keep it in my pocket. I'd like something with a small head unit that displays all my important data.