I am looking for something with more than 600rms yes for the power to spare but my head unit doesnt put out much voltage... like 2 volts i think so the extra wattage would allow me to still reach at least 600 to the sub.. correct me if im wrong but i think that makes sense haha.. sundown products have always seemed nice and im not opposed to spending a little more. I just want a quality product for a decent price. I also am not opposed to going used if someone has some product! Thanks