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Mini Asus and Xotac boxes
There's always a use for another little computer. I use them as backup engines, media servers, server monitors, development staging machines, and more. The point is, these little beasts are under $225, smaller than a printed textbook, reasonably fast (but not, you know, fast), and easy to configure.
You can store a few of them on a shelf, and if it turns out you need a spare computer for something, just spin one up quickly and easily.
What I like: Inexpensive and small.
What I'd like to see: A high-performance option.