EDIT: I had a brain-fart and didn't realise that there was a page 2. This post refers to the last few posts on page one and some of it should probably be disregarded.
Glossary of potatoo's post:
Source: the thing that plays the music
DAP: Digital Audio Player (Also, people will often use the word DAC which is Digital Audio Component)
Rockboxed (clip+): Rockbox is a change in the firmware in the chosen DAP (Firmware being the thing that kinda drives your player, controls the interface, etc. kinda like the Operating System of a computer) It is most common to do with the Sansa Clip+ MP3 player.
The iPhone is actually a decent source - It's not as common audiophile choice as it actually deserves, probably because of the possibility of receiving a call or text in the middle of your music, etc.
But nevertheless it's a pretty decent source in my opinion.
Whether you want an amp with it... well, i like having one. It's like the cherry on top of my cake, if you will. I personally recommend trying out your new earphones with just your iPhone, and if you feel like you need.. more, then add an amp
Or try a new source, that can be exciting as well.
Hope I helped at all,
-Jaster