Which speakers to the radio??

Hello to everyone!!!!!! I just bought a new car radio – output power: 4x 50 watts Now I like to listen to loud music. So far I have never been lucky with such a thing either the sound with “normal” loudness was disgusting or it has been screaming at some volume!! I also don’t want to install a power amplifier or any HiEnd touch. So how much watt and other characteristics should the speakers have? Can you recommend some to me? It must be possible to be able to hear sufficiently loud music in proper sound!! Thank you!!!! martin