I'd go for Durst. They had a cheap series of honest but toy-like enlargers, and a professional line like the 7 and 8 series (I can't remember the model numbers, they were like 707 or 805 and so on). There was also the very good M601 and later the M605 (there was more metal and less plastic in the 601, but both good). You will also have to decide if you want a colour head, which is a diffused light system with colours that you can dial in for B&W variable contrast paper, or a condenser head with which you use the Ilford contrast filters in a drawer between the light bulb and the condensers. I would prefer the condenser system, and today you can substitute the old tungsten bulbs with an LED equivalent. The trouble with the colour heads is that they require special "dichroic" halogen bulbs which often burn out, are hard to find and expensive, and also the colour filters may have faded after 40 odd years.
A plus of Durst is that it was the most widespread enlarger back in the day, both the "amateur" models and the "professional" ones, so you can easily find parts and accessories on the SH market.