Which model Garmin do you have now?
I have always assumed that all their sports watches and fitness bracelets could connect to their chest straps, but apparently I was wrong?
Anyway, any Garmin Forerunner or Garmin Fenix will meet the requirements you have listed.
Some of the differences between their cheap and expensive models are the types of activities you can choose. Hiking may for example not be a choice in the cheapest models.
Also, you will probably have less options of creating structured workouts in the cheap models – or at least it used to be that way.