3 years with the default suspension

Hi

I have a hyundai getz 2002 (1.3).
I dont know much about cars. I know the basic that a car has suspension+springs. I want to change them, because i have the default.
I am searching for a economical kit (suspension+spring) around 400-500 euros. I live in greece and there is no kit for hyundai getz at this time. A friend of mine put koni yellow with ebach springs, but it cost a lot of money.

Any idea?

Thanks