I think you should try a set of comply tip before you go off spending money on ANC phones. If not, I still don't think ANC headphones are the way to go for somewhere as quiet as a library, maybe look at a beyer DT 770 or a V-Moda crossfade. ANC really only come into their element in airplanes IMO.
Edit: this was in response to n00byn4t3r
I'll take a look at the tips you linked, but I still don't think that I would want IEM's.
Edit: the shipping is way too much on them, I don't want to pay 11$+ shipping.
Edited by n00byn4t3r - 4/24/12 at 12:26am