Hi all - We have decided to purchase some heart rate monitors to make sure we are "in the zone" when riding. I have been researching for hours and hours... there is so much info out there and so many heart monitors! I think I am starting to go crazy My first question is, do we need coded transmitters because we are obviously riding so close together...?! Secondly, I don't want to spend a ton of money on this part of our riding gear (maybe about $50 each)... so I have been looking at the Sigma monitors and the Sport Instruments - anyone care to share on either of these? Which heart rate monitors are you using? Liking and/or disliking? Thanks so much!!!