Well I've had a Nak. First the 40 then the 45. Yes they are damn good headunits. Cosmetics pissed my off though. Nothing there at all. But still sounds good! Not my choice though.
Had eclipse also. Good headunits not to much skipping, by the way the NAk didn't skip. Clarity was good, the 55090 is still one of the best, but something about them was buggin the hell out of me. So I went and tried a Clarion......
Ahhh I feel so much better. The clarity is excellent, bass and treble are very distinct. I think it has 4 preouts, but I'm possitive it has 3. Oh did I forget to mention the DSP. The other clarions can have one added on, but the 9675(the one I'm a proud owner of) has it built in. Oh yeah there's a a 64 bit screensaver(but I have to admit those bore me now), seat and time alignment, built in equalizer, and sub control. It really is one of the best units I've had. If you hurry you can catch them at a great discontinued price(sounddomain. com has them i think.). They are now being replaced, the new ones have had the screensaver pulled, but they threw in more equalization and you can attach the dvd changer now with no extra hassles.
But no matter what I say or anyone says for that matter, you just need to grab one of your favorite cd's and go to your local dealer and blast it,play with it, what ever it takes but use your own ears.
Have fun.