To be honest, for a daily driving amplifier, unless you have some experience i would not advise the Stetsom amps.. The lack of a subsonic filter, which blocks the lower frequencys, really kills the ability for it to be a good daily driver amp IMO. For test tones, i'd say go with the stetsom to save some cash, but for normal listening (ie music) i'd definitely recommend the Sundown over both without a doubt. I've heard great things about the older us amps, but Sundown gives both amazing customer service and amazing results.. I run my Sundown 3k daily on a 150 amp alternator and a single kinetik 2000 with no problems whatsoever..