I went for the Bilstein B12 kit, which is Bilstein dampers with Eibach Pro springs, costs about £600 I think. Very happy with the drop and handling. I have a thread on here with pictures if you want to see.
Theres a lot of choice out there including coilovers, so don't rush into anything and do shop around.
I was advised against SE dampers with lowered springs as they need to work together well, I was told by many people that you end up with a poor bouncy ride, as AWBimmer said, do it once and do it right