I have searched some prices and what do you know, stax is not that much out of the range, provided they perform accordingly to their pricetag that would be worth it.
My Problem is that I begin toloathe the veiled, dull heights on my HD25 and as my musical variety has shifted since I boughtthem am looking for getting that fixed without spending a fortune. Hm, what is important to me... I hae heard several cans described by others as being "warm" - and hated them instantly. I also tried the K701 of a close relative for quite a while (and yes, it was driven from a fitting amp, the man has a rhinelander) and disliked it for being flat at the lower end. No punch, no forward precision. The soundstage is not that important, A bit less "in the head" compared to the HD25 would be a nice bonus. I searched and looked and read - and still have absolutely no Idea. I knew of the HD25's dissatisfying heights when buying it- but as I listened to metal and electronica mostly then that was in myopinion alright and the fabulous punch and energy seemed to compensate. Nowadays I find myself enjoying classics and jarr to a much greater degree then when I bought it andam thus looking into... well, imagine a crossbreed between the HD25 and the K701, there you have it. As for grado: They seem to me as a somewhat exclusive non-EU-thing. Ridiculously overpriced here, an SR-60 goes for 139€ in germany. AlsoI was looking into something that was more capable for extended listening (and compatible with myhated glasses), so again:grado's out. Beyers seemed the choice of the moment, but still... I've no idea.
Too bad that my wallet refuses to grow accordingly.
I'm not entirely convinced you will love the DT880, as the strengths of both the hD25 and the K701 lie in their mids and tone. The DT880 has detail and soundstage, like the K701, and does have more bass, but the mids are relatively neutral and "boring".
Have you heard the HD600? I recently listened to them at a meet and really liked them. They're right about the same price used so they're worth looking into.
X2, I too am not convinced the DT880 is for you. The issues I have with the DT880 (I am even thinking of selling them) is the neutrality and politeness of them. Also, vocals/mids are not so much outside your head, but inside.
The HD600 might be a pretty good choice for you actually.