Öhlins are renowned for the excellent absorption of their rally dampers. The rally dampers are the ones in the picture posted by Erik. They are height, bump and rebound adjustable separately. Rally dampers come in various specifications such as tarmac (about stock length and relatively soft hydraulic valving) or gravel (longer and much harder in order to handle high speed bumps and holes). They are indeed very expensive. $6,500 for a set sounds about right.

Lately, Proflex, a Dutch company, have done a lot of catching up and reached, if not exceeded, Öhlins level in competition suspension. Their new "Evo 3" damper features 2 ballbearings for increased strut stability. This is the highest level of privately available competition suspension we're talking about here! It's what European GrN rally champions such as Gustavo Trelles use in their Evo. Only WRC spec dampers are better (the Evo 7 WRC evolution 2 I saw had 2 separate gas containers directly fitted to the lower strut part of each damper! )

The Öhlins suspension in the first pictures of this thread posted by Michael is different from the rally suspension, as pointed out by Michael. I do not know the exact specifications for these dampers, but some of the main differences between these and the rally spec dampers are:
- springs
- adjustment possibilities ( bump and rebound cannot be adjusted separately)
- gas reservoir (internal vs. separate)

In other words, these are comparable to TEIN or equivalent suspension systems from their characteristics. I suspect that they will be more comfortable, though, as the Japanese tend to supply extremely (too) hard springs with their kits and Öhlins dont, and Öhlins always make excellent hydraulics. More comfortable doesnt mean less efficient, though.

As for spring rates, anything above 70 N/mm will be too hard for fast road or even track use.