I have used the Simmons-Omega B22XL since 1971. It still functions perfectly and you can also do 120 film with it. You'll need to buy a 75mm lens for that in addition to the 50mm for 35mm film. You simply change the condensor setup. Takes two minutes.
XL means that the shaft that holds the enlarger head is extra long. This means that you can make 16X20's easily. It also means that you can unscrew the shaft from the enlarger baseboard, reverse it, and project down to the floor. In which case you can make 30X40's.
Of course, at that degree of projection/ magnification, you are using 120 negs. I have the Rodenstock lenses and they are wonderfully sharp.
Then there's the Besseler 45, so you can do 35, 120, 645, 6X7, and 4X5.
You'll also need measuring beakers (glass is best), a good grain scope, a contact printer, and a good, fully adjustable easel. Plus, of course, trays in various sizes and a couple of NIkkor stainless steel developing tanks (2 reel, 4 reel) plus stainless steel reels. And a whole bunch of inexpensive bits and pieces. Paper safes, etc.
On and on. If you do get a set up I can explain how to make dodging and burning tools.
Go for it. You can buy 100 foot rolls of Tri-X and a bulk loader, so film will cost you about 30 cents per roll.
Cheers,
Ted