I suggest an upgrade to the gtx 570, personally. I can vouch for Acer's 27" 3D monitor. The brightness can really be cranked up to compensate for any darkening experienced when using the 3D glasses. nVidia's just done a refresh so you would probably want to see Asus' new 27" display as well. For a smaller size, and smaller price, Asus' 23" displays are well spoken of.
Edit: In addition to the 3D, using a 120hz refresh rate in day-to-day windows stuff is really nice.