Yeah they are cool and IMO the 2.0 TS is the best handling and better balanced all rounder in the 156 fleet.
Koni FSD's and Eibach Pro kit springs is the way to go... an Eibach A/R bar kit front and rear will also sharpen up things on the twisty stuff.
One thing to do though is a must before any engine /tuning mods...
Upgrade the front pads and discs at the very least before going for any more mods. Tarox do a good matching road/race kit, so do EBC. You will find your safe stopping distance will virtually be halved!
Do all that and it is similar to having a TS with 200bhp+ as far as point to point driving is concerned.
"All the power in the world under the bonnet is no good if you can't actually put that power down and control it" Jackie Stewart!
Supercharging has seen dramatic power gains on TS's but your engine and cylinder head internals need to be matched and in good condition. Not recommended on a high mileage example though!
As already said above... Cambelt, water pump, variator, idlers, tensioner and a good service is always a good place to start and give you the confidence to start tweaking things further... After all, there is no point spending all your hard earned money on mods only to find that the cambelt snaps a week later, junking all those nice new parts