I am going for the bilsteins as yes the HRs are firmer but on these roads that maybe not a good thing :S
if you want firm then i think you should spend about 200 quid more for the ASTs and be done with it!
after running AST's on my daily, i wouldn't recommend it, on track yes there brilliant, on the road they soon wear on you
The car will mainly be used on track but I have to drive the car there and do not really want to be worn out before I get there, how bad are ast's for road ?, its not my daily briver.