I love my Denon AH-D5000 if size isn't too big an issue. I wouldn't be thrilled throwing them in a backpack though. I'm a prog-metal listener and they sound great. I love folk and classical through them as well. Good luck on your search!
PS...They have a really neat little amp for about $350 called the TTVJ. That should take care of limiting you to no amp...in the future. No need to go spending all kinds of money right away.
well i do have the E7 as a portable amp/dac. yes, the D5000's are nice, but im not so sure i can find them within my budget so the D2000's would be the alternative