I had a K701 for a while, sold it last October. DT770 is fairly bright. I've never tried an HD600, but I want to.
I'd say that 'in your face' is a combination of a lot of things, between attack, close soundstage, particular emphasis on any part of the freq. spectrum (not just treble). I've always thought that hot treble is sort of a way to convey illusory detail, making something sound detailed when it might not be, by emphasizing delicate parts in the music and overtones.
I really love my HD650s, I've had them since the beginning of my head-fi journey, and they've outlasted every other headphone that I've had other than my Pro4AATs. However, I think that any of those three that you're considering are an upgrade from your current rig. Don't discount the value of amplification and a proper source when you make that step up, though.