You cant expect to lower a car 100mm on coilovers and retain ride quality. It just isn't going to happen. There simply isn't the travel in the springs to cushion the bumps.
I dont expect to be able to nail my 16v everywhere I go, it's a trade off against the look that I want to achieve.
On uprated ARBs, I would say that in my experience, anything that reduces body roll is a double edged sword....yeah in the dry your car will handle like it is on rails, but in the wet you are on a knife edge and you better have quick reactions because when the back decides to let go you aint gonna have felt it coming.
I have to drive my 16v extra cautiously in the wet. Again, it's a trade off.
For everyday use and fast road driving you can't beat a Koni/Eibach set up for value and performance. That's what I use on my G40 and it handles awesome (no mean feat for a Mk3 Polo) and a few mates use the same set-up on Mk2 GTI with excellent results.