If this will be your first CNC machine, I would recommend sticking with your plan to get the Shapeoko, particularly if you plan to use it for woodworking. The main things the Nomad offers are higher mechanical resolution, smaller footprint and integrated enclosure. It is good for working on smaller things that require high resolution such as jewelry. You would probably not want to have the Shapeoko in your office, but you could have the Nomad there. It is a great machine, but I cannot seem to find the time to use of it very often.
Here is an intro video by Winston Moy. He also made a video about creating a silver charm on the Nomad.