What is the best way to ship a desktop computer cross country?

I know some people try to ship large items (such as a desktop computer) as luggage on an airport. However, it seems to be risky. Thus, what is the best way to ship a desktop computer across the country? UPS? US Postal Service? How would you go about shipping it and how much does both the normal service cost to go along with the insurance?What is the best way to ship a desktop computer cross country?
Did you save the packaging that it came in? Cos if you did, then shipping it by UPS is pretty safe.

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