Recommendations for headphones under $400?

    uberwaltz,

      If you want good, accurate bass that's able to go as deep as the music demands without sacrificing mid-range and treble performance, I'd suggest either the Oppo PM-3 or Sony MDR-Z7. 
      The Oppo use planar magnetic drivers while the Sony use exceptionally large conventional drivers.  Both are closed back, very comfortable and very good but slightly more than your $400 budget.

Tim

@noble100
Has been a couple of recommendations for the Oppo but only ones I see remotely near my budget come from Hong Kong and not sure they can be trusted to be genuine?
Have to keep searching....

At the much reduced price of around $250.00 NOTHING can compete with the HiFiman HE-400i’s!!!While they don’t go as low in the bass as some choices the wonderful rich midrange and extended sweet treble make for hours long listening sessions with no fatigue...Decent imaging and staging and fairly easy to drive...Should sound fantastic with the Schiit amp!

@freediver 
They are definitely well within budget!
Quick eBay search shows $210 new and $150 preowned.
Research time......

uberwaltz,

     freediver has a good suggestion with the HiFiman He400i's.  Very nice planar magnetic headphones.  
    If you want to go with a planar magnetic, there are also some from Monoprice that are less expensive headphones that are very similar to and may even be made by HiFiman.  They look very similar and are $200 new, here's a video review of the Monoprice M560's:
www.youtube.com/watch?v=vgAf-_aGR5M&list=PLsm0YcQ-5gn0jpVfKNZuimVUB7OmbLpEy&index=14
     This site, Zreviews on You Tube has a lot of headphone reviews, including the He400i's, Oppo PM-3's, Sony Z7 and many others. Freedriver is spot on; the bass is very good but doesn't go really deep.  These really shine in the mid-range and treble, though.
 
     Probably a good site for your search.  Please post back on what you decide.
   Thanks,
     Tim