I just put in a new front stage, just last week. It consists of the Morel Tempo Ultra 602 2-way components. Got rid of my Kappa coaxials and had to drill holes in the door panels for the tweeters. Best move I ever made regarding sound quality! Next move will be to replace my 6x9s. Will probably put in a set of Morel Tempo 69C 6x9s instead of just disconnecting my old 6x9 speakers and putting in a sub.
Oh, almost forgot, I also put in an Arc KS 900.6 amp last week, as well. My system is starting to sound pretty darn sweet!