I answered all my own questions. Let other's learn from my good-natured foolishness though - read through and plan out your configuration thoroughly before buying stuff. Any question can be (and probably has been) answered on these forums.
steppers dont seem to depreciate a great deal on ebay, you can always sell the motors.
im not sure why refrain from product development. You see very often on manufactureres website "The new ............, available in november"