The DT 770's look great, but I don't know if I can swing $170, plus possibly the price of an amp. Maybe if I decide to wait I'll save a little more, but for right now I think they're probably not going to work. The Zoros look nice, the only think I don't like about them is they try too hard to look like Beats, which makes them look a little cheap. Though if the sound quality is as good as I've read, I could probably overlook that, but I feel like there are other headphones that sound good and don't look as flashy. I hear lots of really good things about the Sennheiser HD 280's, so I may go that route for over ear headphones. The only problem I hear about them is that they are a little uncomfortable.. I dunno, at this point I'm still pretty indecisive..
Pointyfox - $200-220 used is a little high for me, and I feel like I would rather have a new pair at that kind of price anyway. The other options you listed are just more than I'm comfortable spending on a pair of headphones. Maybe I don't have good ears like you audiophiles, but the difference between a $300+ headphone and a $100 headphone has never really been outstandingly noticeable to me, though I do notice it a little bit, and I can tell when I'm listening to really cheap headphones. But the $100 mark is about when I stop noticing significant differences.