be prepared to do a lot of research - go to headfi and start there. there are DAPs that offer 24/96 LPCM
and beyond, DSD64 and beyond, great chips like the AKM4490, and can hold 1-2 flash cards, and up
to 256GB. they range from $20 to thousands. and even better things like optical outputs and in some
cases, ability to use the DAP as a DAC (and especially with great DACs inside).
The Asian markets gets first crack at these simply because the US markets are saturated with iPods and
phones playing music with the music already DAC'd (MP) or with low res audio. you would have to do serious
research to decide how to keep your proprietary formats and how to convert if necessary and how to store
and download.
the next problem is how the unit works, folks who have had iPods since day one may find difficulty
in transitioning to different ergonomics - function and placement of buttons, menu traversing, and
everything they've been used to.
the big problem is the differences in music tastes between many of these early users and the almost
standard genre favorites here in the US. It's difficult to get a comparison when you read about a great
Asian female singer that you've never heard of. or they don't play megadeath, nine inch nails, black Sabbath, etc.
I think the unintended consequence is that these DAPs become our complete music storage systems
for those who don't stream or listen to free music (like FM, TV music channels). I see terabyte(s) storage,
DACs that do OS, and high quality hardware.
you have one alternative that a lot of folks go to: repair the 160GB unit. find and pay for that "new"
HD or find some creative guy who will upgrade your 160 to 512GB using flash and eliminate the
mechanical HD problems once and for all.