Shipping Hardware Cross-Country?

ae0nflx asks: "I just graduated from High School and the computer that my parents gave me four years ago has finally died. I've decided to spend all that money that I've been hoarding for a few summers on a new G5. The problem lies in the fact that for college I'll be moving to the East Coast (Upstate New York), from the foggy shores of the San Francisco Bay. Does anyone have any insight on how to ship my brand new machine cross country? Cheap would be good. I'll be flying back in late August and I don't think that I'll be able to take her back with me because I'm assuming she'll be a little big for the overhead bin... I'm not sure if I can trust this to the Postal Service alone." It may not be the same as shipping the big iron, but when you trust your hardware to any shipping company, be it Federal Express, or UPS, you do have the expectations that what you ship, will get to where it's going, and hopefully get there in one piece. Which shipping companies would you recommend for this job? For those who have done this, what experiences have you had, and what suggestions can you pass on to ae0nflx?