Ordered the Sennhieser HD600 headphones, 2 sets of tubes (JJ 6V6gt, and Electroharmonics 6V6gt) , the Behringer DAC, some new interconnects, and a few other goodies. Everything is estimated to arrive by July 2nd at the latest. Thanks for the input and advice. I am contemplating snagging the Jolida Glass FX III Tube DAC/Headphone amp and leaving it hooked to the HD600s http://www.jolida.com/product/glass-fx-tube-dac-iii