Thanks guys for the valuable advice!   seems AE2 and UE6000 are good choices for me too, i shall dig more info on them!   Thanks!

I'll be using this headphone for my study, blocking out household noises and aid my concentration.   my requirements are 1. comfort (hav to wear them for hours) 2. noise isolating or cancelling   indeed sound quality is of less importance to me    i've been looking into the...