FiiO had a model with a scroll wheel, though most if their range is touchscreen Android based. A few if their models have dual SD card slots - currently up to 2x 256GB, but someone might have got 512 to work. They mostly use ESS Sabre DACs, which have the reputation that Burr Brown or Wolfson used to enjoy.
There are other vendors offering similar kit, ranging from £100 to £stupid, but their names escape me right now.
Like discrete compact digital cameras, PMPs haven't disappeared completely due to smartphones - the survivors have just got better and and less expensive.
However, some versions of Samsung Galaxy phones, some of the LG G and V series phones and some others offer very good audio quality (the dac and amp stages) - and will take SD cards and offer more flexibility in terms of content than the dedicated players
Biting the hand that feeds IT
