For the money the Bilstein is a great product. I have seen a lot of dampers pass through our dyno and the Bilsteins tend to "match" better right out of the box. Just because a damper is adjustable does not make it a better product. Due to production tolerances, full soft on one damper can respond the same as mid-range or full hard on the other side.
If the dampers do not come with a dyno plot from the supply house, find a local dealer and have a pull done. It is worth the time and money to get a matched set for the vehicle, you will notice a difference.
Here is a link to give you an example of what a shock dyno pull will tell you:
http://www.accuratetechnologies.com/performance/Default.aspx?tabid=139
