Nice to see that Sony still calls them MP3 players. https://electronics.sony.com/audio/walkman-digital-recorders/c/walkman-mp3-players
Your existing phone may be enough. What would you like to do?
Take a quick look at the Remotes topic on our wiki so you know what can be done now.
My phone is definitely not enough. The way I use it (car, ski condo) I want a dedicated device. One with lots of storage (the Sony has an SD card slot that supports 2TB) My library doesn't fit on my iPod classic with 160GB, so I want something bigger.
To elaborate: I have a second home about 4 hours away from my primary residence. I use the music player for the drive and when at the other place. I also go on long car trips elsewhere but I don't carry it around otherwise so a dedicated player makes the most sense to me. And if I get a phone call or a text I don't want that interfering with the music.
I'm sure there are cheaper devices out there, but $350 is not that much in the greater scheme of things. If I was still working in pro audio I'd pony up the additional $500 for balanced outputs, but I don't have a use for that anymore.
Open to other suggestions...