They're just great, if you listen to the right music. But I constantly find myself listening to something between pop/country and other quite relaxed stuff...
Equal makes them better for that, but ideally I'd like something I don't need to eq. Something clear and with good soundstage. Good isolation would be a plus.
I'd be willing to spend up to 100$/70€.
Btw. How much do you need to spend to get a better sounding headphone than the superlux hd681?