I just got an answer from Eizo Sweden regarding my question about the Eizo S2100 noise level , the answer is translated from swedish
" I have listened on a S2100 here at Eizo and it is completely silent.
A very faint "buzz" can be heard if putting ear against a 24" Wide version , this probably comes from the fact that these have another background light construction."
Actually they don't use the same panel (NEC 2190UXi comes also in S-IPS panel version). However, NEC 2190UX is by far best of 21" models. It is pricey, but for that money you get one of the best LCD displays on the market (although if you're not into creative industry / graphics you might go with some cheaper model).
I think the NEC LCD2190UXi is overkill because i don´t do anything but textbased applications ,I´ve read at some forum that the NEC 2170NX is humming so maybe the Eizo S2100 is my best option ?