What would the general consensus be on these two fine phones? Currently I have the Beyer DT990/600 and a Headroom micro amp/dac which is just ok but definitely tons of room for improvement. I feel like these cans are just under-powered and really want to upgrade to one of the above headphones with either the Lyr or Mjolnir (Schiit) amps and likely a Bifrost dac. PLEASE comment on these selections ASAP as I need to send these phones/amp/dac back this week and get whatever it is I will end up with headed this way. Thanks!