406 speakers and cable?

greetings my masters 1997 model peu 406 sv oto. I have a car. my problem is about speakers. I want to change the front and rear speakers. I also think the cables are broken because the sound sometimes goes and sometimes comes. What brand of speakers do you recommend? I will be tied to the tape above normal so it should not exceed 250 liras. =) Can I also exchange cable and speakers myself?

I recommend the pionneer brand, it sounds nice, there are cables etc in the box