The best and most economical route is a Power Tap, standard model. Polar has had a lot of complaints about the 720. The SRM is a little more expensive but has better software. If you buy the Power Tap, you will have enough money left over to buy the compatible software from
www.cyclingpeakssoftware.com. Download the demo. ISS and IF are two cool tools added by Dr. Andrew Coggan.
How hard did you work in that last race? Did you overtrain last week? Are your easy days easy enough and your hard days hard enough?
Some people want to know what the numbers say, not what they think they felt. I'm one of them.
-Robert
"How wonderful it is that nobody need wait a single moment before starting to improve the world." ~Anne Frank