Hey cool I'll give those a try the only thing for me is that I kind of don't want to spend more money on amp/dac if I can get cans with low impedance and perform...roughly as well. I've heard lots of great things about the q701 and dt880, but what drives me more towards the ad900x is the low impedance I would consider getting amp/dac further down the line. But if you say that superluxes are considered bright, doesn't that put me into grado territory? I've heard the sr60i and wasn't impressed do you think coming from superlux's I would like anything from their line?
Well I'm not sure about Grado's, it's not a brand I know well. I do believe the DT 880(maybe the DT 990 as well) to be the best choice for you, especially if you like brighter headphones, they also come in various impedance ratings. Lower impedance doesn't necessarily mean easier to drive, AKGs are a good example of this. I wish I could tell you about the AD900X but it's not a headphone I have tried, so anything I say about it right now will be guesswork.