FIrst of all, thank a lot for all the hints and help i got.
I think i will go for the two SWS8 under the frontseats and a sub in the trunk.
But i ve no clue what manufacturer and product i should prefer ( please help)
Just saw this youtube video (showing the SWS8 Earthquake, which look very valuable with this kind of "metalmembran"):
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I ve according to my nationality a europe e92m3 and i were told that there were differences in the soundsystem.
Also we have other price/value - relations here in europe (the "cheapest" SWS8 Earthquake costs 180€ ~ 240$ )
I m also considering between installing it by myself or asking a company for it. I m not sure how many problems might occure and how difficult the adjustments will be.