I recently mounted the Bilstein B14 (fixed rate dampers) kit on my EP3 and it really did transform the car. So much more body control and yet soaks bumps like a boss. Even more comfortable I dare say. I believe the DC5 will use the same or very similar kit.
Budget?
Bilstein B16 are really good.
I'd get B16, they can be had for around £1200 or so, then get some Hardrace rear camber arms, front camber bolts. I believe it's the EP3 track rod ends you need, a quick Google should advise. You'd have a fair amount of change out of £2000 to put toward pads, tyres etc. If not the B16 then perhaps look at Nitron but you won't get much, if any, change out of £2k.
What is the particular benefit of the rear camber arms on the DC5, is it lacking camber at the rear??