I current have Koss UR40, KSC75's, and KSC55's.... I kind of was on a Koss kick, hah.
What do I currently want? Actually, just one pair: ATH-AD700's. I know they're not expensive or as high end as what a lot of you guys go for, but they're actually like my dream headphones right now, haha.
I'm pretty happy with my open cans: DT990 and SA5000 w. Black Dragon. For closed cans, I have the W1000 and really want the W5000. If and when I get the W5000, I'll be done with closed cans for a while.