I'm looking to get a new 27" iMac w/ the i7-3770, 3TB Fusion Drive, and 2GB GTX 680MX. I'm guessing the CPU upgrade will be around $300, the Fusion Drive around $300, and the GPU around $200, but it'd be really nice to know what the actual BTO prices will be. Anyone have any guesses as to when we'll see detailed pricing info?