most ppl would tell you to get the most expensive ones you can. personally i say listen to a few brands b4 you buy and see what you like best. i mean there is a big difference between a pioneer mid/high than a sundown or something like that. theres also a difference in one brand between its series of components, which im sure you know already, but they can sound totally different. im doing my own build on a budget so im going for the "mid" grade brands and im using kickers and they sound pretty good and can take a little bit of power to.