bipolar o unipolar stepper ?

Hi !

Which kind of motor do you prefer ? Unipolar o Bipolar steppers ?

I'm designing a cnc table of 100x150 cm x 50cm height useful with
mobile bridge (table fixed).

Which motor power for the stepper do you think I need ? I like to
use this machine to cut and engraving wood of 3 cm of thickness....

I hope to reach a tollercance of 0,1 mm for the machine.

What do you tink about ? It's a dream ? :-) ?