Personally, Id try to find some 2-ohm speakers, like these http://www.crutchfield.com/p_1086020...=6020cs&tp=106 I got a set of those on eBay for about half price to put in the doors of my truck and they sound incredible. Theyre amp'ed up now but sounded amazing just running off the HU. Of course, theyre a little more trouble to install but well worth the effort. Im hip on Inifinity and Alpines but the Alpines are usually a little overpriced IMO.