First of all, for the recording engineer, the most important thing is to use a headphone that he is very familiar with. Every headphone has colorations; if the engineer isn't familiar with a particular phone's colorations, he won't really be able to make the final mix sound like he wants.
Second point - variety is good. It's common practice to check a mix on a variety of speakers and headphones. This can turn up problems that might be hidden on just one set.
Comfort shouldn't be overlooked too, particularly, in my experience, for the voice talent. The thing is, though, what's comfortable for one person isn't necessarily comfortable for another.
I guess what I'm saying is -- get one of each.
Seriously, if you are planning on getting four headphones, for example, get four different ones, with at least one open and at least one closed. I haven't heard the EH350 yet, but all the others mentioned here should do nicely as part of a small headphone inventory.