Hi y'all, I'm thinking about upgrading to the HD 650s from the D2000s. Now, I found the D2000s to be fatiguing/bright so I ruled out the HE-400s. I could have gone for the HE-500s, but I would not be able to afford an amp/dac within my budget ($600), and the LCD-2s are just out of my price range (for now). So the HD 650 + ~$200 amp/dac looks like the best path.
I'm mainly wondering, how much should I pay? They've been around for a long time, so what's a good deal on one of them new or used?