FallingEdge
Member
Didnt hear the A900X myself but as far as I know they are better in almost everything (mids, highs, soundstage) except bass quantity.
They're a little pricey than the M50 though.
On Amazon there is only a $30 difference ($119 for M50, $149 for A900X) so the price is a non issue. Portability is more of a concern as I plan to take them to and from work and will use them at home, at work, on vacation and long trips and that type of thing.
I always have this problem too. Research it too damn much. Keyboards, mice, monitors, etc. Once I pull the trigger, I am happy with what I get but the journey there is a pain.