i called the Greek dealer to check prices for some parts (rear brake rotors, clutch and pressure plate, shocks).
the total price i got for them is................. 1740 euro - around $2200 !!!!!!

i know i won t be needing them shortly, but these are consumables and in a year or two, i will eventually have to replace them.
slightly off topic: After what s been said in this forum, i believe that stock Bilstein and H&R springs have a fairly good result (i got feedabck from KW and BC owners too), so i will go on with the stock springs.
so, from that ebay store, i got springs with shocks, i will try to sell the springs, pressure plate and disc, rear brake rotors, maf, map, floor mats and 3 opel GT emblems at a total of 880 euros, including trasportation (hope i will clear customs with no additional taxes)
