Even today, the iPod hardware is excellent and long-lasting; if you ever need a portable music player with a long battery life and that's great for hacking, try getting a 5th-generation iPod Video and upgrading it. It's fantastic: in a matter of weeks (shipping takes time), I made a 256GB iPod Video that could play nearly any format (Ogg, FLAC, WAV, MP3, etc.) and that has an over-24h (I've not been able to run its battery down yet) battery life.

Its main advantage, though, is its ease of repair and upgradeability: an amateur with a plastic pry tool and a screwdriver can do nearly anything in a matter of minutes: replace the battery, replace the LCD (which are extremely cheap), upgrade or replace its storage, replace the headphone jack, etc.