The Rockford Fosgate is the best one I have seen yet besides the short lived Alpine CDA-7878, which had the alpine DSP unit built in, but for some reason its already off the market. My roomate has the sony, and its a POS. I have heard the Aiwa was decent but couldnt find anyone that had one so I could play withit. I found most of these while on my MP3 search, ofcourse all outdone by the empeg.