As it's now further up the forum, mine is the just audio AHA-120 with the Grado SR60s...

That's my rig... It was tested against a fiio Mont Blanc, and it was like night and day in terms of sound quality. It drives the grados well, which the iPod couldn't on its own. Thanks to Paul for the upload, it turns out that I had been browsing on head if but hadn't set an account up, so...