beyerdynamic dt235 are pretty nice, they look wack but they sound amazing. I dont have as much experience as most ppl here, but they definitely sound tighter and more accurate than my sennheiser hd238 (which cost like $70). One thing that I really like about them is they don't feel like music is being blasted right next to your ear, if you know what i mean, I almost get the sense that the music is coming from outside the headphone, thru the headphone, and into my ear. Instruments especially, vocals not so much. I'm sure there's some word to describe that, but i dont know what it is.
They are a little weak on bass though when I play em off my laptop, but when I play them off my receiver they sound PERFECT. A nice blend of all frequencies, I don't think they have any kind of artificial boost at any freq range. I'm a straight up hip hop head but when i'm rockin these I find myself listening more to rock/acoustic music, maybe they're geared towards that, i dont know. These headphones definitely got me diggin back out a lot of music i aint listened to for a while. The only experience I have with headphones over $25 is with the two i mentioned above, so take my opinion for what its worth.
I caught these for $45 shipped from amazon