Hi there. assuming that you don't speak Korean, i'll answer in English.. and excuse me for not just tagging a reply, but it wouldn' t work on macs.. so my apology in advance!
my suggestion is: go with the PSP if you are planning to use the device as more than just mp3 Player. I do own an iPod, and i love it, but i like it because of its simple funtion as hardware storage and music player. PSP is Sony's new next generation of walkman -- portable multimedia device, and i'd say the money is worth it.
but then..as i mentioned earlier, if you just want 'portable mp3 player,' then apple products seem just fine. iPod mini or Shuffle, that would just depend on your preference..
k, good luck. :)