HRM or calorie tracker for working out?

Hello!
I'm looking for suggestions on what brand of HRM or calorie tracker to look at buying. I need something simple and under $150. My workouts consist of both HIIT and circuit training with weights. I am not sure that the exercise counter for MFP is accurate for me. I am focused on losing weight but I feel that if my calories burned are not accurate it will mess up my weight loss. Thanks!