WayTooCrazy
Headphoneus Supremus
Got a pair of 650s, and they sound pretty damn nice with my pinched waist miniwatt PCC88.
If you are considering a pair of closed, might I recommend a pair of NAD Viso HP50s? They sound unreal (in the good way) with my philips (Ei) PCC88.
Having never heard either, I'm torn between either Oppo PM-3s or Hifiman HE-400i for my next pair (whenever that is).
I enjoyed both the Oppo PM-3 and HE-400i with my Vali2, but I much prefer my EL-8 Open to both. You can't go wrong with either, but if you already have the HP50, might as well lean towards the HE-400i. It is more detailed than the PM-3 and has better highs and more forward mids. The bass is more detailed, but less in quantity to the PM-3.