Modern apo enlarging lenses still don't go cheap. The people who want them know what they can do and will pay accordingly. Once you get into something as big as 5x7 or 8x10 film, you can substitute apo graphics lenses, which tend to be superior optically to ordinary enlarging lenses, but have smaller maximum apertures (typically f/9). But in shorter focal lengths you're going to pay dearly. Over the years there have been some cheap stat camera lenses rebranded as economy "apo" enlarging lenses, but these aren't the same thing, so don't get fooled by mere marketing jargon. All
the serious lenses were relatively expensive at one point in time, and some still are. If you want the Rolls Royce, choose from the Apo El Nikkor lens series, expect to pay thousands if you can even still find one. But the average amateur enlarger won't even hold a lens this heavy without deflecting
something, so you'd be wasting your time even if you are rich. Of course, you can always buy an expensive enlarger to match it. Or do like I did,
pick one up for free, and then need to knock out a few walls to install the monster, if you have a high enough ceiling to begin with. Heck, it beats
working on greasy old cars! But in terms of general-usage enlarging lenses, they're going at such a bargain right now that you can buy more than
one if needed, and keep the one you like best. For example, I sometimes use an 80/4 El Nikkor (non-apo), which cost next to nothing and is a wretched choice for the medium format negs it was marketed for, but using only the center of the lens works very nicely for 35mm film. (The better El Nikkor for med format is the f/5.6 version, though I personally use a 105 Apo Rodagon, and yes, anybody with a decent set of eyes can detect some kind of extra something from this that isn't present in a print made with an ordinary enlarging lens).