Hi Alex,
I'd say so......it's all very well biting it all off in one go,but very costly.
I did it in bits,and I think in order of effectiveness it would be:
ARBs
Coilovers
Brakes
Then:
ALK
Bushes
Then:
Haldex controller
And if you go down the same route as me:
Adustable topmounts and track suspension etc......not what you want!
Also,a few of those steps are not worthwhile if you don't have track setups on the car to be honest.
I wouldn't bother with the Haldex controller if you aren't obsessed with handling ,and adjustable topmounts etc are in the same category.