Headphone Amp Recommendation

I would match up your AT with an amp that works best with lower impedance phones. Creek OBH21 can do low or high impedance (more dynamic) or the GRADO RA-1 battery (smooth and very natural sounding with very good detail).

Not sure of the Meier but I think the ciaudio works better with Sennheisers.

Head-fi is full of 20-somethings who like bass so loud it crushes their brains.

I find Head-fi to be a valuable source for headphone related questions. I've contributed/received information several times and I'm an old fart FWIW. I'm not familiar with either of the amps you mention, but I just purchased a WA 6 from wooaudio.com and can recommend it very highly.

I agree with Uraniumcommitee about the Stax sound (I've got Omegas --the most comfortable for me.) For dynamics, The Headroom Max (the affordable previous generation) works well with my Senn 650s and AKG 701s. (The AKGs are the best-sounding dynamics and are by far the King of Comfort in the entire headphone world, IMHO. At about $350 street price, I think every headphone user should have a pair.) But nothing really sounds as pleasant and detailed and non-fatiguing and integrated and just plain real as the Stax Omegas with the matching amp (I have the tube one). I only wish there were speakers that sounded so nice.