If I've learnt anything on dampers/coilovers, its that whatever you buy they always bloody knock/leak/break, even decent stuff.
For that reason, for 600 quid, the BC and D2 stuff is perfect for the pulsar, just don't get springs that are too hard.
Japshop now even sell single replacement damper units for the d2's too, 100 quid or so (BC also do the same). They also did me replacement front springs (5kg), which I swapped for the stupid 8kg ones, its ssooo much better now.
There's little point to buying Bilsteins/Koni's/AVO's etc (if you could buy them, that is).