As to not repeat perviously stated comments, all my cockpits are Polk MOMO 6.5 coaxials (the ones they discontinued) and I love them. Powered at 4ohms at 75w per speaker they absolutely rock all levels of sound and clarity. Even ran a set on my tower at one point and was happy with them. Cant go wrong with Polk, and while I dont like the DB series, I too have heard great things about them. Have you possibly considered JL 6.5 coaxial marine speakers? A little more money but you get the performance of JL. I too would stay away from Kicker, I have not heard their new HDLC's but I am not big on their products, mostly personal choice though. Just my 2cents.
Current - Rinker R1
"Its easier to beg for forgivness than ask for permission"