I have read many times that the K550s sound very similar to the Q701. If this is true, then they are a likely candidate. I am considering an open set, as well, despite my living conditions. How do the HD650s hold up when gaming? I need a set that can handle games, movies, and music.
What's stopping you from picking up the D7000? MLE says consistently in his original post (and throughout the thread) that he loves them for all those purposes*.
*Except competitive gaming, but that's not one of your requirements.