thanks for the help
Well the factory speakers are non existent, i bought some cheaper speakers to the front doors, not anything great but still surprisingly good. I though that it would become cheaper to just buy the parts here in Finland... About the car, it is an old vauxhall astra mk II sedan. And my music taste is pretty much eurodance and drum n base stuff.
I was wondering that would it be really dangerous of buying some amplifiers wich have been used for a couple of months as this would allow me to buy some good quality ones (maybe digital) a lot cheaper than the retail price...