Want a CNC for parts with curves that would be difficult with a manual mill and such small runs (1-5x) it wouldn't be worth the time to design complex fixturing.What are you expecting to buy? Manual machine? CNC? DRO? Any clue what you want to make? Or just ability to fix something with more balls than a drill press?
An example would be dies for silicone molds for small (<5³") likely out of aluminum. I'll likely also make parts for 3D printers out of aluminum (brackets, carriages, etc.). Beyond that, I don't have specific projects in mind. I'm sure I (and my wife) will dream up ideas for plastics and ferrous metals.
While I appreciate it's a vastly different tool (price, size, capability, purpose, etc.), this is a lot like my 3D printer and laser cutter hobby. I had a few things in mind, but I kind of had to get my hands on it, start designing a few things for them, and get a feel for them. Then more and more ideas for use cases pop into my head.
That doesn't help a ton because I'm basically saying, "I want to be able to do all the things." I get that. I guess the best way to think about it would be "robust prototyping" meaning one-off, but usable parts (i.e., not just for fit or one time use).