My current "production" machine is an 80gb ipod video. Since everything is currently working, I figured I would mod a second unit in order to gain some appropriate skills. That is why I purchased a second 80gb ipod video. Both are 5.5g.
The original machine has a new battery (purchased on Amazon, I have no idea how good it is but the seller came up first and usually that tells you that the vendor is reliable) and a new video screen.
The second unit for sure will need a new front case part, and I am not sure what else. I figure I will be dropping in a new battery and add either a msata or SD card drive. It is encouraging to hear that the PNY works in the unit being auctioned at ebay. If I get unit number 2 working then that will become the production machine I suppose. Fortunately "refurbished" 80 gb ipod 5.5 video units are popular on ebay US right now.