Shimano wireless Flight Deck from Licktons for $102 delivered.
Pretty straight forward installation. It took about 7 minutes the first time to program and about 3 the second time.
I love the virtual cadence and gear indicator. I never look back now and my cassette.
It has all the features that I find important.
I'm not interested in a altimeter or inclinometer.
I do wear a Polar S210 HRM.
Good computer and a pretty decent price.