If I had one, I would give an CNC of your choice for a top notch CAD mentor. With good CAD the need for high end machining is less. Without good CAD, high end machining is difficult.
With Solidworks & Autodesk donating their products, the ability to model the robot is there for teams with the will to do it. Our team isn't there yet, but we are working on it. [sarcastic irony] BTW one of my favorite things to do is to walk around and say "The Mentors obviously cadded your robot" [/sarcastic irony]
With 80/20, modular gear boxes, plywood & VEX stuff you can build a competitive robot without a mill or a lathe.
A complete practice field is a huge advantage. That is why we actively encourage teams to come use
ours.