I actually have and use a sansa clip+.  I still think, although it's possibly just some sort of odd placebo, that I get a huge difference with simply the fiio E3.  I haven't played with any of the sound settings, so maybe I just prefer the changed sound signature, I don't know...although I...

Preferably less than fifty dollars, maybe willing to go higher if it's some level of diy and I'll get some sort of fun-factor from building the thing.  I know it's a little backwards, but...oh well.  Not that I know for certain I'd have time.

Last year I decided to get my first full size headphones, and after a period of deliberation I decided the ATH-M50 would be the perfect set for me.    After a few weeks of listening to them, I eventually decided that they would benefit largely from an amplifier, a concept that seems in...