The most common in the USA are Omega D series, Beseler 45 series, and LPL (Saunders/LPL 4500II, 4550XL, Omega/LPL 4500/4550). All will produce excellent enlargements as good as your capability. All are solidly built and parts are available.

My preference is for the LPL because it works very smoothly, and offers some nice accessories, such as a masking frame for the negative carrier stage, and a remote focus wand--ingeniously simple and effective, for when the head is "way up there" and you want to use your grain focuser.