I have always gotten Sennheisers, so that may be a bias. I currently have the Senn HD 280 Pro and the HD 598.
The HD 280 Pro is a closed back phone with excellent sound isolation, if that is a factor. It is a tough phone, not so easily damaged, and the pros are said to like it partially for that reason. Even my wife hasn't damaged them, and she even uses them as close range speakers. They are very clear on voices, if not as open as the HD 598. The sound is quite good but not very warm. They do tend to fit tightly and some find that uncomfortable. It never was much of a problem for me, and I think they loosen up some with use. A PC soundcard will drive them easily. They list for $100 at HeadRoom and $97 at Amazon.
The HD 598 is very comfortable, and I really like the styling--which my wife thinks is retro. The sound is excellent, very open and smooth. It's a really fine headphone. A PC soundcard seems to drive them very well. They list at $250 at HeadRoom and $213 at Amazon.
The Senn HD 449 looks interesting for a closed back phone. It is $120 at HeadRoom and $99 at Amazon.
The HD 518 is an open backed phone, and looks to be a cheaper version of the technology on the HD 598, with somewhat heavier bass, according the measurements at HeadRoom. Head Room lists it at $130 and Amazon lists it at $105.
It is often hard to audition the headphones one is looking for.