Well you people did it to me again.......just ordered a pair of HP50's today.
That's 2 pairs of headphones, a DAC and an amp in less than a month! (Sorry about your wallet is right!)
On the plus side I got my Beyerdynamic Premium 990's for $229 and the HP50's for $219 (not refurbished....but "open box"- full warranty). So that's $680 worth for $450.....not horrible.
Geez for that I could have picked up a pair of Senn's 650's! Actually I'd much rather have they Beyer's and the NAD's than one pair of 650's.......but that's me.