ExplorOz Team replied:

Dave, we personally can vouch for the Bilsteins. We ran a feature on their top of the line Platinum series (from Lovells) see Bilsteinsplus we ran a review on performance after running them through a 58 day trip over the Gunbarrel, Tanami, Bungles, Mitchell Plateau, Gibb River Rd, Pilbara.
reviewMaybe you've already read this and want other points of view, which is fine. Just make sure you read it.

jeremy replied:

I can vouch for both Koni and Billies, they are both a unbeleviable shock !, i run Koni's on my Discovery and being adjustable make them a shock that can be adjusted to suit your needs !, also i have fitted a set of Billies on my brothers TD5 Discovery and they handle amazing ! As for springs check out 4 way with there tough Dog springs ! Good Stuff !............. Good luck.