I'm in the market for a new HRM but am thinking that I might upgrade to a Garmin 305 or 705. Right now I use a Sigma unit w/cadence and a separate HRM. What are the pro's & cons of each of the set-ups? I should say I ride about 125mi/wk 52 weeks (rain, sun, snow), like to ride for the training and may race again one day.

Let it fly boys & girls! THX!