I prefer the 990s over the Pro 900 myself. Just stating that the Pro 900 is the closest closed alternative to the 990s that I have heard.
The D7000 is my fave all time headphone, followed by the HE400 (didn't have as much as bass as I would have liked), then the HE-4 (though the HE-4 is more like a super DT880, and not as musical as the HE-400).
Overall though, the 990 is my stable favorite in terms of having most of the things I want in a headphone. Bass+open (a rarity), clarity, comfort, velours.
If it wasn't for my distaste for any non-velour padding, I'd have kept the D7000 and call it a day.
I wasn't too thrilled with the Pro 2900s. I expected a lot better. The Pro 900 was okay, but with glaring faults. I'm no fan of S Logic.
Edited by Mad Lust Envy - 11/4/12 at 6:53pm