I actually like "bright-ish" headphones when listening to female vocals. Don't ask me why... Really liked the Shure SRH940 which can be found relatively cheap used if you'd like to try it as well as the Spider Moonlight cans. HiFiMan HE560 did a very good job handling female vocals and with decent gear driving it (since it seems you have a good budget) they should perform quite well. Also liked the layering and sound of the SRH1840 (which basically reminded me of a Senn HD600 anyway and it seems a few have already mentioned them) but not everyone loves it.