Compilation of Golf IV (excluding Sub)

Hi, need a compilation for my Golf IV, 3 doors. Would like to replace the front speakers and install kick basses in the rear mounting areas, because I (because of my parents) very reluctantly want to move the trunk with a sub. Amplifiers and cap come into the trunk. So as I said, what I need is: -Headunit (I probably buy Alpine 9812RR) -Kick basses (i.e. 165mm large) -Front system (also 165mm) -Strengthener (is it worth 2 V here at all) My musical taste is mostly techno. I would spend 300€ for the kick basses, although I haven’t seen any kick basses in the price segment yet. What kind of kick basses are there? I get the HU for 365€ and for the front system, amplifier and cap I would also spend 500€ again. Thx Olze