There's a ton of us here who would give you great advice. But I think you need to spend a little more time thinking this over from another perspective:
Why do I want / need a pair of headphones?
For example:
1. My stupid roommate is too loud.
2. My wife hates how noisy my current headphones are.
3. I take a bus 6 hours to work and back every day.
4. I receive secret messages from outer space, and don't want anyone to know I'm wearing headphones. Etc.
Once you get that sorted, then it boils down to a matter of taste:
1. What type of music do I listen to?
2. What type of sound do I like? Heavy, thumping bass vs. Light controlled bass? High treble vs. Warm treble? Lots of nice airy soundstage vs. Tighter studio environment? Etc.
Answer the first question. Then answer the second question, listing your likes and dislikes. Then you will get a ton of answers that will prove very helpful to you.
As of now, the question you are asking is too open-ended, and either no one will answer, or the few good people who will answer will give you a mass of information you cannot really use.
Just for an example:
8 months ago, I needed a pair of headphones to listen to on my computer. I already had a pair of Etymotic ER-4 which I loved, but they were impractical to use at home. (I also feel that full-size headphones are impractical to use outside of home: I don't want the looks, and I like to keep my full-size cans pristine by leaving them at home when I'm away - on their special headphone shelf, i.e., my bed).
So, I had a pair of Koss PortaPro for computer use, that was awesome. However, I moved into a noisy apartment complex, and with those being on-ear cans, I couldn't even hear them above the din of my neighbor's football games.
Thus, my search began.
Obviously, because open cans let in outside sound, I needed a closed can - and not just any closed can, but one that also sealed out the outside noise. Ex: an M50 does a great job of isolation; a D2000 does not. Yet both are "closed" cans.
Next, I wanted a headphone that didn't break the bank. Again, an M50 seemed to fit.
Finally, I listen to mostly techno when I hear headphones, so I wanted something that had thumping bass, good midrange for female vocals, and highs that were nice but weren't shrill. You guessed it, the M50.
What did I buy? The M50. And I loved it.
Fast forward 6 months later:
Recently I had a nasty injury that left me with sensitive ears that ring easily. On the flip side of life, I inherited an awesome tube headphone amp. Plus, I have recently build a standard wall over the window that faces my neighbors - if you can't beat 'em, build a wall between 'em.
Thus, what I needed was a can that was light on bass, of great quality for the amp, and being closed wasn't such a priority any more. Plus, I had a little more money than last time.
Yada yada yada.... and according to my personal tastes, the AKG-K701 has been the perfect fit.
In Summary:
So, all this nonsense to basically say, we need more information, and then you'll get a slew of great advice that will turn you onto the right headphone.