The motors you picked are a good choice.
My Z axis has a slightly smaller motor, but the 118 is a good motor.
Also now i know what you are doing the 752 will work fine on the Z axis.
Are you getting the ballscrew kit from CNC Fusion in the states? if so it is good.
Also you will see some pins that need to be removed, they are tapered so they will only come out one way, i learnt that the hard way lol.