Mark Fish does the standard Konis, but also some re-valved ones that are 25% stiffer damping. I'm going to do them to mine sometime, along with the springs, exhaust, stereo, 36K service... lol
Yep. Mark Fish will sort you out with a re-valved set of rear dampers for around the £300 mark but they are re-valved to suite the stiffer springs I believe, which he also supplies.
I just have the standard Koni Yellows on mine at the min but will be sending them to Mark Fish for re-valving and a set of stiffer springs in the near future. The standard Koni's work very well on my car atm mind.