I used to be a car audio installer for a long time. Ive seen the good bad and the ugly of the car audio market. I personally have used Infinity, Polk Audio, Boston Acustic's, Fosgate, JL Audio, Kenwood, Sony, Pioneer, Clarion. Im prolly forgetting some others. However, sometimes higher priced parts doesnt always mean its the best. (my .02) It also depends on the application as well as what its being used for.