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Unless you're going to disassemble the engine and change pistons, you aren't going to run much boost pressure with a supercharger on an M5, and I don't think that even for $45K Dinan's contemplating swapping in a lower-compression longblock (which would also complicate smog-certification enormously.)
The 470hp package sounds like a reasonable approach, though it's still a fair bit of money but not out of line with other vendors/mods.
The blower package is another story- a little boost pressure (so minimal HP gain) from a centrifugal blower (so it's all top-end power) on a very high-compression engine (so fuel quality and detonation avoidance becomes crucial) plus the extra weight, noise, and engine compartment clutter of the blower installation...forget it.
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