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Steve. Please don't go down the route of buying the electronics until you have decided and built the frame because as you learn (like we all have done) your goals will change.
That kit you pointed...

Every time a noob designs their machine I pop up and say, "Do you really need 12" in the Z axis? It will give you a massive overhang because most of your work will be in the bottom 1 or 2 inches"....