I have to agree with Jmac with the naks...awesome sq...but they don't seem to be as dominate in sq as they where a couple of years ago.Unless your going for a great sounding deck with no features and an oem look, then I would recommend looking at the Eclipse 50 series and 80 series decks. Think the only diff between the 50 and 80 is the onboard eq and dot_matrix display.... OOooo and the origin of the names...
5423, 5433 are 5V out
8023 , and 8443 have 8V out....
( but that voltage gets dropped if your using a 5v eq like me so the $100 more for 3Volts more that your in reality not going to use......)
And I have nothing against Blaupunkt....but they aren't really in the same leageu as Naks or Eclipses.......