I agree with your points pinksatin... but I think the models that get the most jobs often fall in the "in between" category. They are built, but not overly muscular, and they also are slender enough for the "beautiful/gorgeous" jobs instead of only the hot/sexy ones. In the end, they get the most runway/campaign jobs because some designers like Burberry favor the skinnier models, while Dolce & Gabbana tends to favor more built models. The in-betweens can work both ends.
As for face, the same principle applies. It seems that many brands want models who can appear both masculine or beautiful (not necessarily feminine... it's hard to explain). They want range. Good examples of such models are Kevin Flamme, Marcus Hedbrandh, Mathias Lauridsen, and many other members of Models.com Top50.
This is of course mere speculation. I don't work in the industry, but from what I've seen, this appears to be true.