Our ZRE152 factory stereo (base model) has started playing up. It says there is a disk in there when there is not, so time to get something a bit nicer. Our budget is the minimun we can get a way with, but we do want a reasonable sound. Do all aftermarket double dins stereos fit? I see some talking about 200mm etc. Are the factory upgrade decks (say from a Levin) worth it or should I go aftermarket. What are some decks worth looking at, something that is more just plug n play with out manually soldering wires etc, but do want an output for a sub. Are the factory speakers ok, they sound pretty dull playing from the factory deck. If they are worth upgrading what are some direct fits. Anyone used those underseat subs. Are they ok or should I go for a full 12" box setup. I want some decent bass.