For the axes, you will want:
X, Y, Z, and a spindle. That would be a 4 axis Galil controller. Then, if you want an A rotary axis, add one for a total of 5. And I would add another for your tool changer if you think that a servo will replace the existing tool changer motor for a total of 6 Galil axes.
It's important to remember that to control a spindle motor, not matter if it's a servo drive or a VFD drive, you will need a Galil axis for it.
Steve