Hi Micra-man,
FYI in the end I ordered a Weitec sports suspension kit from Germany...
http://www.weitec.de/2003/produkte/ultra.php?lang=en
This kit includes both springs and shocks (front & rear). These shocks aren't adustable like the Koni dampers, however the lowered springs and dampers are specifically designed to work together.
I wasn't able to find any reviews about these kits fitted to Micras... however i did find some VW Golf forums where people talking about them and were very pleased with the results. The VW Golf people reckon they are excellent value for money....
I ordered them through the following supplier in Germany.
http://suspensionsupplies.us/?lg=en&pg=products
Don't worry, the guy (Fredrik)that I have communicated with via email speaks english.
The Australian Weitec distributor quoted $1400 for this kit !... However, direct from suspension supplies in Germany the cost was around $700 including postage (but may be some customs charges when I collect).
I expect my kit to arrive this week.... You will need to be patient as mine was on backorder for 4-5 weeks....
However, I have been very happy so far with the service from suspensionsupplies. Fredrik returns emails very quickly and keeps you up to date on the progress of the order.
I hope this helps... If you are interested I will post some pictures of the kit once it has arrived.