I've narrowed it down to a focal component set for the front and one of the new pioneer mp3 decks for my new head unit. I just can't decide what model level I want in either case. I've got two questions before I make my final desicion. 1) For speakers, I can't decide between the Focal 165 K's and the 165 K2's. Is there a big enough difference between the two to warrant the almost $100 difference I'm seeing them go for? Do the 165 K2's sound that much better than the 165 K's? 2)I'm looking at getting either the Pioneer DEH-840MP or DEH-8400MP. What exactly are the differences between the two, b/c I've looked them over, and didn't see any, unless I happened to miss something. Thanks in advance for your help.