Bump. Still deciding whether I want to ship these out or not. Leaning towards no, but I can be swayed if someone can tell me the right way to pack computer components, or if I can find the right way myself. In the meantime, prices dropped on the 7970s.
I ship stuff all the time, I hate hassle and just use the USPS flat rate boxes. Video cards and motherboards I have been shipping in medium flat rate (rectangle not square) boxes with anti stat bags around the devices taped shut then bubble wrap. I break down the box and include it along with accessories.
larger items like your PSU may fit in a large flat rate and your options open up as long as you or your buyer don't care about maintaining the original packaging.
For the smaller items like CPUs / memory/ media , If they fit in a small flat rate box with bubble wrap its good otherwise a medium square and bubble/paper/peanuts.
I just keep a bunch of the flat rate boxes on hand (all sizes) since they are free from the post office and they are ready to go. No need to deal with people asking for shipping quotes all over the county... just print a label tape it to the box then check the box for a pick up outside your door or put in the mailbox or drop it off.
This is just how I do it, I have gotten good feedback on my packaging on ebay and I make it so simple that I get crap out of my house quickly... (might pay more for the flat rate but the low hassle means I will actually sell stuff)
I PM'd you a few days ago, I am interested in the CPU and possibly the PSU.
I can vouch for the effectiveness of keeping the flat rate boxes on hand. I have one of each size, and two of each medium on hand. They are a real life savor. Just stuff them behind something until you go to use them.