I just got a HRM-pro to replace my old non-smart watch and strap, but I find it hard to pick a (inexpensive) watch to go with it. I thought I could just use the strap with the Garmin app in my iPhone, but realized it doesn’t display HR in real time. I’m not planning to wear it 24/7, mainly in the gym for running intervals on the threadmill, HIIT training and strength training. So I don’t need a fancy expensive runner watch. I’ve been looking at vivoactive, Venu and Forerunner, any advice? Thanks!