Post processors for me spell confusion.

[magicniner]

I am unsure what CAD CAM or justCAM package to buy. I only hope when I try some on a trial version the providerwill sort out a post processor for the trial version for my machine.

Unfortunately that is unlikely, no one writes a dedicated post for a prospective customer, you'll have to evaluate CAM systems without a dedicated post but most will have a set of generic posts available including a Mach3 post processor, one of which should be close,
Regards,
Nick