I think it depends on what you are looking for. If you want cheap multicolor just for PLA, a Bambu Lab A1 or A1 mini is a good choice. If you want enclosed so you can add other "engineering" materials like ABS, then the Bambu Lab P1S with AMS is a good choice. I have 2 of these, and 2 Bambu Lab X1Carbons, which have a better color display, and I have some older PRUSA printers. The only problem with these multi-color/material printers is they have lots of waste when changing filaments for multicolor. Snapmaker just announced the U1 which is a 4 toolhead printer to greatly reduce this waste, but its not out yet. Bambu announced the H2C to help there also, but not out. If you just occasionally do multicolor, the first two are fine, certainly to get started, and PLA filament is cheap.
I probably print true multicolor 10% of the time or less. You can also do multicolor by printing each piece separately using a different color, and gluing or snapping pieces together, which eliminates waste. So unless you know you HAVE to have many things multicolor, I wouldn't worry about waste to start.