I know that there is a few different type of cricuts. Which one, in your opinion is the best, and what is the difference between them? There is the create machine, personal electronic cutter machine, and the cricut expression. Which one should I look into buying?

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I am looking into buying a Cricut. Does anyone know what the difference is in the Cricut Expression, Cricut Personal and the Cricut Create (think thats it). What does one do that the other doesnt?