I completely agree. I used 2GB SanDisk Extreme III cards. Larger size cards are just asking for trouble in my opinion unless you are in a situation where carrying extra cards and swapping simply isn't feasible. You are taking a risk by putting so much data on a single card. Spend the money on one of those storage devices like an Epson P-3000 or P-5000 and offload your cards when they are full. I run with three cards all the time. One is in the camera, one is offloading into the storage device, and one is empty and ready to swap out into the camera. If the card in the camera fills before the card in the storage device is finished offloading, the third card comes to the rescue.I won't use anything bigger than 4 GB in my D200 even though it'll take larger sizes.
It takes a few seconds to swap a card. Why put all your eggs in one basket?
Proven? You are not familiar with mathematics or Shannon's information theory, are you? The proof is solid and indisputable. It has been proven decades ago.It has never been proven that compressed raws are any lower in quality vs. uncompressed.