Heart monitor and cadence sensors are listed here http://www.gpscity.com/garmin-dakota...cessories.html
This is also helpful - http://www.thisisant.com/directory/dakota-20/
Last edited by Roosterbird; 03-07-13 at 06:55 AM. Reason: added info for ANT devices
What mount do you use?
The Garmin one, listed as an accessory
I bought a Garmin 705 on Ebay and I love it. I got mine for $232 and it is complete with cadence sensor, heart rate monitor and the North America map data base. It does every thing I want it to and was considerably cheaper than buying an Edge 800 or 810.
2011 Giant Defy3 Composite
2012 Specialized Hardrock
you can use open source maps which are free. So if you do find a good price on one of these (particular refurbished ones), it nice to know you don't have to pay for maps.