I use IEMs on the road most of the time, but I'm still enjoying the V-moda M80s for closed phones. Amazing control of the drivers straight out of the iphone (amp not necessary). However isolation is not the best, so... I'm probably of no use here.
I listened to the HD800s next to the K-1000s at the last meet which put to rest any interest. Great sounding phone but I'll stick with the HP-2 and K-1000 till something better comes along