I have to thank you guys for recommending me the Superlux 668B, they outperform my Senn IE8 (which is amazing, as they cost me 170€ 2 years ago, while the Superlux's cost 27) in clarity, which is what I was searching for. They don't lack bass at all as I've read, at least not for me (I'd say they are bassy, but hey, I'm the Sennheiser kind of guy
). While they are not Beats by Dre, they have good, crystal clear bass (can't say the same about the not-bassier-just-worse-sounding 681's, which lack a lot of bass clarity, and is not punchier as some people say).
I'd actually recomend the Superlux 668B to anyone (and I bet they are the best quality headphones on the sub 100€/$ area). They are 27€, so, if you don't like them, just give them to a friend or girlfriend or whatever. They will most probably be better than the headphones people usually use. But, you might love them, really. Overall, it's an amazingly good performer, and real bang for the buck. Music under 320kbps does sound horribly bad, itunes quality music doesn't sound that good either so ALAC or FLAC libraries are welcome (when buying 27€ headphones, you don't really think you'll notice the bitrate that much, but as I said, this are really good performers).
So while the one who recommended it to me had kind of an arguement with SennheiserHD, I must say I really appreciate the suggestion, as it saved me a lot of money, and best of all, I got really good heaphones (they clearly outperform my Senn RS180 too).
BTW, AKG pads are a MUST. The fake-leather original ones are really uncomfortable, don't adapt well to the head and leak sound, thus making the headphones sound worse than they should.
Last thing to say, they don't sound that loud with the iPhone, so I wouldn't really say they really are iPod/iPhone friendly (they sound well, it's just that they aren't really loud, as I know a lot of people who like to play music at ear-hurting levels). And they do leak a lot of sound when playing music loud (as I normally do when I really do want to LISTEN to the music, not just playing it as a background while doing other stuff).
Hope this short review helps for people looking for this kind of low-budget headphones. I'm posting it here to thank the ones who helped me, to help others and also, because some of the things I've read about the Superlux's aren't really true.