Sub & Power Amplifier

Hi people I have a question. I have a Golf 3 and would like to have a final stage and a sub. My music direction is hardstyle, if it is needed for the sub. I have 250€ to 300€ available and would like to know if you can recommend something to me. However, I would like to have the sub with a box. I would be very happy if I got left to the shops where I can look at your suggestions. Since I don’t have so much idea what I have to pay attention to I would be happy if I got left to the shops where I can look at your suggestions. If you could keep helping me here. Thank you.