Running watches. So many choices?

I use Map My Run on my phone and listen to Pandora. I have a separate heart rate monitor watch (and chest strap) that I often wear. I have been thinking about getting an activity tracker to track steps, etc just to get myself more motivated, but I can't fine one that does everything I want. The Polar M400 does all that I want, but it's not a touch screen (not sure if I care that much about that though). I would love to find something that can have music as well. I feel like if I spend $200 on a watch that has gps and I can look at pace, etc, I also want something that I can have Pandora with. Otherwise I sill have to carry my phone and then I can just use Map My Run with my phone and get a cheap tracker with no gps.
Is there such thing as a good running watch that also has ability to play music? Are the Smart Watches what I should be looking at?

Added (1). I don't have an iPhone so apple watch not an option.
Do you really use the HR monitor when running? Is it beneficial. I use mine just to calc calorie burn the best. Can I assume I would still need HR for that with the gps watches?

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