i would suggest an adire audio shiva set for subs...they sound awesome and have alot of low end output needed in a convertable http://www.adireaudio.com 125 dollars each... far as fronts go if you have a good compenent set you dont NEED rear fill at all..simple set would be a set of cdt briaxials if tyou have stock door speakers these will just pop in...also think about a good amp to power these would suggest at least a jbl 80.2