I'm with davereo on the Cateye Strada. I use the Double Wireless model because of the cadence. I use a separate watch type, Sigma HRM because there are times when I want to use the HRM for other than cycling and don't want to kill my iPhone battery any fasster than what those apps already do.
HCFR Cycling Team
Ride Safe ... Ride Hard ... Ride Daily
2012 Colnago Ace
2010 Giant Cypress