?100 will buy you some farily decent speakers if you search tound the net. But you do get what you pay for. Dont go for ones with loads of wattage if you are running them from the head unit, as they will be underdriven and sound terrible. The existing speaker wire will be fine if you are on a budget, but should you consider using amps, then use the pre-outs from the head unit and a quality cable from the amp to the speakers.