Phil
I've got Tarmac Bilsteins up front (will check the spring rate), as you would expect they are hard but it handles well on them.
Got some spax on the back but am fitting shorted adjustable AVO's to take account of the fact my beam is lowered one spline.
My beam is from a 309GTI which as widder track

Good mod if you are tracking it.
For that matter you can 309 front wishbones and shafts to give you some camber, maybe a cheaper option than the adjustable arms?
Maybe look at udrating your rear beam mounts as these will be knackered if its still running originals. Pug sport do some solid mounts. Engine mounts could also do with up graded. Not a plug but if you want a very stiff lower engine mount let me know as I sell them
Spent all last winter and this summer sorting mine, started with a bare shell. New parts nearly everywhere. I've got an Mi16 on throttle bodies, it goes well

even after weeks of probs with it
Brake upgrades, I've got Alcon 4pots which a brillant. Bought them second hand so weren't as dear as new. If you want I can give you the contact details of somebody thats sells 206GTI 180 brakes. They are a straight onto 1.9 hubs, my brother has some fitted, haven't faded on him even after serious track use (standard pads

)
You are right about the roller top mounts and adjustable bottom arms, they are a good choice. I plan to fit some over the winter.
My user name is the same on there as on here so send me a pM if you want a mount.