Have you thought about just using amplified terrain? Every Biome in your World would become mountainous, and they all go way past the clouds.
The general consensus, IIRC, is that Amplified worlds don't look natural, even by Minecraft standards.
You're certainly correct, and what people will like in a particular world is a matter of personal taste. "Different strokes for different folks."
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There are no dangerous weapons. There are only dangerous people. R.A. Heinlein
If you aren't part of the solution, then you obviously weren't properly dissolved.
7271781327109099575 is a good Savanna M seed (go somewhere around -202 108 406, follow the link for more images and a strange village generation). It seems that Savanna M has way better generation than Extreme Hills (possibly due to its height limit of 256 as opposed to Extreme Hills' 128).