Peter's comments on the Beseler 23c are irrelevant to the Beseler 4x5 series. I've owned and used both, and used Omega D series. The Beseler 23c is an excellent B&W enlarger if you add a cold light head. The dichroic head is useless. The Beseler 4x5 series is a completely different enlarger.
All the enlargers you listed in your question are excellent. The D2 is the oldest design, but they still work and accessories are atill available. I prefer the Beselers but that my be because I learned how to print on a 45 MCRX.
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