First timer with HRM

Good Morning everyone! I was wondering which HRMs you guys use, and which ones you think are the best? I'm very interested in getting one, as i want to have a better idea of how many cals I burn each day. I have lost over 100 lbs, and I really need to up my exercise to combat the 'skin sag'. I count every cal that goes in and I really want to count every cal that goes out as well. I also want to track my heart rate and my sleep patterns as i don't sleep very well. i have done a ton of research, but nothing is as good as what actual people say and recommend. Thank you for your input!