Nakamichi, Eclipse or Alpine

IMO the Nak and the Eclipse are in a class above the Alpine.  Also IMO (and in the opinion of several other reviewers and testers) the Nakamichi CD700II is the absolute best CD player available for car audio.  When compared to any other CD player on the market (even esoteric players from companies like Linn) it is more accurate, has better DAC circuitry, cleaner sound with wider frequency response, more stable CD transport mechanism, better signal to noise and lower THD at full pre-amp output, and more dynamic headroom (it can easily reproduce the full 96db of dynamic range possible with a CD.  No other mobile audio CD player can do that reliably.)  It will easily outperfom the Eclipse in terms of SQ and will satisfy your criteria 1,2, and 3.  However, at $2000 list price it is probably worst for cost, and no it will not play MP3s.  I believe the version II does have the ability to control a CD changer, but if so it'll be only a Nakamichi changer.

Now can you HEAR these differences?  Maybe or maybe not, depending on the rest of your system.  Does the Nak have the ease of setup and flexibility of control found in the Eclipse?  No.  But if you want the best SQ available, I believe you cannot beat the CD700.

Ah, I just checked and you are correct, it does not include a detachable faceplate.  Of course, if someone were to steal your head unit it would be useless without the external DAC that you should locate remotely.

The MB-75 is a much lesser SQ performer.  The MB-100 uses the same outboard electronics as the CD-700, but neither changer uses the advanced magnetic clamping CD transport or the machined aluminum CD tray, so they are not quite in the same league.  I use an MB-100 currently in my everyday driver, by the way, and I am VERY happy with it.