I'm going to offer up
this thread with discussion of recommended tools.
I'm going to agree that a second RoboRio and associated power/control components is a good idea. For the shop tools, keep in mind what your mentors know how to use and how much space you have in your shop. You will need a fair amount of assembly space, and you need some clear areas near the fixed tools for safety.
We do pretty much everything with a drill press, chop saw, bandsaw, and belt sander because we don't have enough space to safely store/operate a lathe or mill. Also make sure you get the right blades and so forth for cutting aluminum (presuming that's your main material of choice).