Welcome to the 'Zone, NeoMiller! Although I don't have any experience with the Taig mills, I have heard good things out about them.
I would think #s 1 and 2 would be no problems. I think #3 may a little slow going, but it should work well if you take light cuts in brass. I'm not sure how well a Taig will handle mild steel.
Edit: Spelling Corrections