Congratulations on your decision. I hope you love it as much as I love mine.
Unless you have a special cupboard to store them upright, I recommend the wire rack too. You might want a couple - my long strip dies go across the 2 racks that I have.
Also, find a place to keep your GO that is very easy to get to. That way you will use it, rather than think it is a bother to get out. I have mine sitting next to my treadle on the floor with the handle towards the wall. My dies are kept in the rack on a top shelf of a white plastic rack. (Easy to see the dies and easy to get out and use.)