How many kva for a control transformer...?

Hello,
I'm getting ready to wire up my control for my cnc lathe
retrofit. I've got real 220 3ph which will be used for the spindle
motor/VFD and coolant pump. I will be needing 120V 1ph for the PC,
breakout boards, relay coils, 5/12/24VDC power supply and my large
36VDC 10A servo power supply. I'm thinking it would be beneficial to
use a transformer dedicated to supplying 120VAC to the servo power
supply, and then use the other transformer to supply 120VAC to the PC
and everything else.

What size (va or kva) transformer would be needed to power a PC,
2x breakout boards, a small 5/12/24VDC power supply and various relay
coils.?

What size would be needed to supply 120VAC to my 36VDC ~10A
homebuilt power supply for my servos?

Wouldn't it be beneficial, electrical isolation-wise, to have
separate transformers supplying the servo drives and for the PC and
control components? Or, should I just go with one big transformer to
power all the 120VAC components?