Following the line of thoughts from Nervis, I feel it is also important to know your work and get the smallest machine that will do the job (I dont mean cheapest, I am talking about work envelope). A smaller machine will have less mass to move (wont wear out as fast) and will often give you higher rapids and quicker tool change. For a prototyping or 1-off shop this is not important but for semi or full production this is very important.
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