I think pretty much its all been said really..
I've got every handling mod going on my FR TDI...
Eibach
Coilovers, ARBS front and back, bushes replaced, upper and
lower strut braces, Engine and gearbox mounts replaced with VF engineering sets, reforcement of subframe etc.
It handles like a nothing I've owned, its not lowered to far, just enough to bring the centre of gravity down far enough.
But i will say one thing that no one has mentioned...
Differential... its the one thing that changed my cars handling the most. Its fine to handle well, but if you put on a pinch of power (especially in a torquey diesel) the whole balanced set up goes for nothing, one wheel looses traction and understeer etc upsets the whole lot.
Yes its the most expensive item in the set up at £1000 odd... but its worth every penny a ATB Diff!