Car stereo guru needed.....

Thanks for the replies guys. I`ve heard nothing but good things about adding a power amp to existing systems. After reading many articles the names Alpine, Mcintosh, JL Audio, and Rockford Fosgate seem to come up the most. Kicker, JBL, and Pioneer are popular as well. There doesn`t really seem to be one amp that is that much better than the others so I think I`m just going to shop for an amp with the proper wattage and a low THD and hope for the best.