With regards to ride heights:

Baring in mind the above table...

Factory front = 132 mm +/- 10mm
Factory rear = 153 mm +/- 10mm

First 7500 miles with stock Bilstein's:

Front: 134 mm
Rear: 140 mm

Upgraded Bilstein's (B16 Damptronics) set to:

Front: 119 mm
Rear: 132 mm

After further 3000 miles:

Front: 112 mm
Rear: 128 mm

Reset to:

Front: 117 mm (giving 5mm more travel in the dampeners)
Rear: 138 mm (giving 10mm more travel in the dampeners)

The sagging is worse with stock Bilstein's than the B16 Damptronic kit.  I'd say it takes between 3000-5000 miles before the suspension fully settles.

The really important thing is the front to rear ratio as you need to get that nose pointing nicely downwards!  I think Chris measured the angle of the car at 1 degree in this regards after we adjusted for the revised factory setting baseline numbers.