I'm buying an ATH-AD2000 soon, but I no longer have an amp to pair with it. The Canamp has long since been gone. Are they any particular amps that have good synergy with these phones? I have heard the hifiman EF1 and EF5 doesn't sound to shabby with the AD2000s. My budget is within a 150-400 dollar range. I'm also looking for a DAC as well to eventually be able to run a Stax 2050A setup from. Similar budget of around 150-400 dollars. I may end up buying the hifiman EF2 to keep me satisfied until I have enough to buy a decent stand alone dac and amp.