I could not recommend that. Ipod classic ($80ish) + 2 weeks to send and get back + For the imod ($250) + shipping ($10)+ special lod cable 'alo audio imod lod" ($200 or used $35ish)+headstage arrow ($280 used $200). And to add salt the newer ipods coming out are beating the old ipod classic 5/5.5 generation. And the galaxy s4 is better then the ipod classic with the imod. If you want a better upgrade then buy the Apex Glacier ($500 used $350ish) and when you upgrade your phone get the galaxy s4 because it has a high end wolfson micro chip (dac) a big step up from the wolfson chip you can find on the ipod classic 5/5.5 generation. And if you wanna spend even more instead of the Fiio L9 lod cable ($12)get a Alo audio lod cable like the triple pipe($200 used $75ish) or the cricket ($175ish used $60ish).
The apex is a overall better amp and also can be used as a dac for your pc that is 100% better then the headstage arrow and a far bigger upgrade then getting a ipod imodded. (it is the one in the middle) And here is a post I found on the form