Hello, and thanks in advance for any help. After years of faithful service my Sony NW-HD 5 recently died. Having spent seemingly countless hours researching replacement options I've narrowed my choices to either the HiFiMAN 601-HM Slim or the HiSoundAudio RoCoo. I've read many reviews (quite a few here; thanks to the authors) but been unable to find any direct comparisons, so I'm here hoping for experienced opinions. Also, I was wondering if the RoCoo P would be necessary instead of the RoCoo D given that I use either Westone 2 earphones or amped external speakers to listen to music. Thanks again for your time.