Fitted some Eibach Sportline springs (30mm actual drop) and some Koni on car adjustable dampers yesterday. Before and after pics below.
My brother has this setup on his 106 Rallye and it is superb. Handling is very good corners virtually flat (dampers on 60% stiffness), understeer is not a problem now. Amazing how fast you can go round corners now, oh and especially roundabouts, its now quite easy to deliberately provoke the back end to step out and have lots of fun.
Before
http://www.clio172.com/images/before_lowering.jpg
After
http://www.clio172.com/images/after_lowering.jpg