Well thats a general question it all depends what you are looking for. I'm more into sound quality so heres my plan. The rears dont matter too much they are just for fill so get some 4" replacements and run them off the head unit. The fronts get a nice set of 6.5" components I like infinity kappa, mb quart, boston acoustic. Amp the components at least 50x2 Get some dynamat or b-quiet for the front door, this will cut down on road noise and vibrations. Do you plan to do a sub/amp in the trunk? I'll go into more detail if you'd like.