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Well if you are comparing this can at its new price to others at their used prices thats not really fair. And didn't you just say the A900X beats them all? Why do you say you prefer the K550?
Your right it's not
I guess if you have a limited Budget [putting everything at "used prices] the Ath a900x beats all of those recommendations due to it's price. It''s the quality of a Mid Fi can at low Fi prices. The other thing to consider is if an amp and dac are needed. If you NEED an amp and a Dac [because they really do improve sound, even with cans that do not need amps, a Dac will improve quality, and you thus need an amp to adjust the volume from the Dac to get the best sound from the dac]
So again, let's assume you hae a $300 budget, no amp and no dac and you want a head phone. The Ath a900x at used price is going to be your best purchase, is it will allow you to have more money for other quality improving compents
Now let's assume you already have a dac and an Amp, then it's all down to preferance. I prefer the Akg K550, and I already have a Dac and Amp.
As far as sound quality goes, I have my Ath a900x sitting with me. The quality is the same as the Akg K550. Both retain details well and have good dynamic shifts. The differance between the two is Sound Signiture. I prefer the Sound of the Akg K550 over the Ath A900x, others feel the oppisite way
In addition the Ath a900x is MUCH easier to fit on your head than is the K550, we know the K550 changes DRASTICALLY with it's Fit. The Ath A900x is not prone to this as much [It has more clamp than the Akg K550 and the Wing System works sufficently well] So assuming more people will fit a ath a900x it is also a better choice for it's ease of use in that regard.
BUT purely based on BANG for your BUCK, the Ath A900x is a clear winner. If you need a money for other compents [and the OP does, does he not] then the Ath a900x is going to allow him to have a better overall experince due to it being pair'd with a better source and an amp. Where as the K550 with only a Dac or only an Amp will not sound as good as the Ath a900x out of a clean source and an amp.
That being said I personally prefer the sound of the AKG K550, but it is not as good a value for some one new as the Ath a900x.