It depends what you are doing, if you just need a keyboard then I think your ordering makes perfect sense. However, for an expressive instrument to be used as a

It depends what you are doing, if you just need a keyboard then I think your ordering makes perfect sense. However, for an expressive instrument to be used as a sound synthesizer, I would definitely put it well above any inexpensive keyboard controller. The cheap controllers don't offer anything good in terms of tactile response anyhow, and suffer from expressive limitations. Take a look at some YouTube videos of GeoSynth or MorphWiz on the iPad for some examples. If the iPad also had tactile response it would surely be even better, but even now it surpasses most offerings.