If I were you I would try to save up and get the Garmin 520 bundle pack. It has the magnet less speed and cadence sensors and the Garmin soft strap HRM included. I picked this up a few weeks ago and it's been working flawlessly each and every ride.

What I was using prior to this was an Edge 500 paired up to the Wahoo blue SC speed and cadence sensor combo unit with the magnets on the left crank and rear wheel. And I was also using the Wahoo Tickr HRM. I had problems with both of the Wahoo pieces that I was using. The speed sensor would drop out at various times for no apparent reason. Adjusting the sensor position to get the magnets closer had zero effect, nor would replacing the battery. It would resume sending data on its own when it felt like it. Issues I would have with the Tickr were that if I didn't wet the electrodes well enough before I put it on it would show a heart rate and then just freeze. The only thing that would get it to unfreeze is removing and reinstalling the battery...and then of course making sure the electrodes were plenty wet before I put it back on. It even happened to my wife tonight with the Tickr, she just did her first couple of rides using an HRM and it froze up on her. Ordered her a Garmin HRM today to fix that problem.

The Wahoo stuff we have is just going to sit in a drawer from now on and kept as an emergency backup that will only be used until we can replace with Garmin sensors. I've had enough with trying to get the Wahoo stuff to work....what a waste of money that stuff was for us. We should have just gone with the Garmin stuff from the beginning.