Yep, as a road and occasional track day, Koni's are a good choice. Definately Give Mike Rainbird a call about the Ahmed Springs, I think they're just what your looking for. 25mm Drop (Sensible), and subtle enough for the road.

I've been in a couple of Sapphire Cossies who have also had Koni Dampers, but different springs, and they crash their way over any bumb in the road and feel horrible compared to mine which uses the same shocks (Koni) but with the Ahmed Springs. They're also a linear spring, so the same spring rate regardless of compression (Within Reason of course).