I have a modern 150mm Nikon and a 150 Rodagon. Both are excellent, and I can't tell the difference in the prints. I also didn't pay more than $100 for either if I remember correctly in mint condition. I have a 180 Componon S and it's also excellent, but I use it for 6x17 (I'll have to try it for 4x5). So you really can't go wrong with any of those three in my opinion.
Enlarging lenses tested
The link is to Ctein's ebook Post Exposure. He took 6 months and actually tested all of the available enlarging lenses. Maybe this will help some with your decision. http://ctein.com/booksmpl.htm
You may well find more difference between specimens of the same brand vs the different brands. I went through a bunch of lenses testing them as Ctein suggested and in my case, found a good 135 Componon-S and a good 150 EL-Nikkor (the old one with a 53mm thread - which also works with 5x7.)