Ballscrews for Grizzly G1006 mill

Hi all.

I searched the archives and didn't find what I'm looking for, so I
hope you can help.

I have a Grizzly G1006 mill drill, have converted to CNC using Dan
Mauch 4 axis servo controller (Nice box btw).

My grizzly has too much backlash, and too much error in the acme
screws and I want to go ball screws.

I started to do the research, and there are hundreds of different
kinds! I'd like to be able to work down to at least .001 tolerances,
but don't know the best route to get there. Also, what ball nuts
would I need/how to mount them, and how to get the ends to match my
machine - Can you get them premachined? (I know you can for
bridgeports, but for the Tawian stuff?)..

I'm doing some text engraving and there are visible errors, plus I
will be building real working engines (models and the real thing),
so I need better performance than I have.

Thanks,