+1 for the Beyer DT990 Pro, preferably the 250 or 600 ohm paired with a nice hp amp.
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Having owned two DT990/600, one DT990 Pro 250, and currently owning the DT990/32, I can easily recommend the DT990/32 as well. Despite the usual "the higher ohms are better" nonsense, the 32ohm is not only easier to drive, but they have a warmer tone than the 600ohm (IMHO), which I find I also find less grating on the top end. The 600ohm is clearer by a bit (I'd say the DT990/32 is 95% the 600ohm), more control in the bass, making it less prominent, which in turn makes the treble slightly hotter, IMHO. I find the DT990/32 to be the easiest on the ears in terms of treble, despite what Zombie has said about the 600ohms having the smoothest treble.
He said that, yet agreed with me that the DT990 Pro had easier treble on the ears than the DT990/600 due to more bass taking the edge off, so his opinion on the treble isn't exactly understandable for me.
No mistake, the 600ohm is the better version technically, yet I find the DT990/32 better for me personally because it's easier on the ears, slightly warmer, yet nearly as good.
I scored mine used (like new) for $197, and I feel it's better than the DT990 Pro, due to the bass not being as overpowering, but still plenty powerful.
I prefer the DT990/32 over the Pro 900. That's how good I think they are.