I went with two JL Audio CL-RLC line drivers. It's better than the Kicker unit on paper (i.e., higher input voltage and cleaner signal per the specs) but also costs more. And plus, I can use both pairs of my HU's full range preouts instead of taking one pair and splitting it into two as with the Kicker. Not sure if there is any real world difference in sound quality though. I got a great deal on them so I chose this route.