Forget your listed choices and look here. These Basic Stax are one the best sounding setups I can recommend under $400. This comes with headphones and amp, so you are set. When you are ready to upgrade the amp to a KGSS or something, the headphones will still work with it.
Alternatively, on the dynamic side, i'd recommend a pair of Grado SR225's and a DIY CHA47 amp. I know you said try to go 'ampless', but with this you'd still be way under budget. These have a more up-front, punchy presentation, which may appeal to you more. When you are ready for an upgrade, get a Gilmore v2, or a Melos, and keep the SR225's going strong.
Those would be my two rec's.
The A900's are nice, and easily drive alone. But I view those a dead-end street as far as upgradability, and in terms of familiy sound (they don't sound like upper-end wood A-T's).
Alternatively, on the dynamic side, i'd recommend a pair of Grado SR225's and a DIY CHA47 amp. I know you said try to go 'ampless', but with this you'd still be way under budget. These have a more up-front, punchy presentation, which may appeal to you more. When you are ready for an upgrade, get a Gilmore v2, or a Melos, and keep the SR225's going strong.
Those would be my two rec's.
The A900's are nice, and easily drive alone. But I view those a dead-end street as far as upgradability, and in terms of familiy sound (they don't sound like upper-end wood A-T's).