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?

I'm not an expert. But i had the same ideas you had. But five years ago. There was a motorola sports watch that could play music, the MotoACTV. I think there's a modern version. Anyway i ended up sticking my iPod nano in my pocket (you could also just clip on a shuffle) and i got a Garmin 305.
I also don't think the touch screen is important.
Pandora would require a cell phone connection. So that doesn't seem reasonable for a watch. But a watch with a small amount of memory could play a mp3 playlist.
If you don't mind running with your iPhone i would take a look at the apple watch.
but if you just want a device on your wrist i would stick with picking out a good GPS/HRM watch and adding a shuffle.
And if you don't mind just using your iPhone for runs. You could use the fitbit charge for everything else.
Some of the best information on sports watches is at DCRainMaker.com
also Tom's Guide.