For the record, a 150mm lens with the proper cone on an Omega D-II will enlarge a 4x5" neg to 16x20" with the standard column. I don't know if there was an extended column that worked with a D-II, but you could raise it or easily rotate the column to project on the floor, if you only print that big occasionally.

Used enlarging lenses are pretty cheap, so there's no reason not to use modern 6-element lenses from the major manufacturers, and it's not much of a stretch to go for Apo lenses that were formerly very expensive (with the exception of Apo EL-Nikkors, which are still very expensive). Ctein published an article many years ago, showing that there was more sample variation among lenses of a single manufacturer and model than differences between comparable lenses from different manufacturers.