The PS500 at CanJam on the Butte and Arrete sounded pretty much like an HF-2 to me. I think you would be happy with it, Shelly. Also reminds me how impressive those two amps are, especially the tiny little Butte with the big gain. It doesn't just make headphone go LOUD, it has a very nice, clean and detailed presentation without being sterile. Pete does good things with opamps.