After months of sitting on the fence and researching various options, I've ordered my first BTO 27" iMac. Really excited. Fingers crossed it'll not suffer any yellow screen nastiness. The only upgrades I did was - i7 CPU instead of i5 - 780 GPU instead of 775 Anyone know why upgrading to an i7 CPU and the 780 GPU would cause a 2 week build time? Est shipping is not until 14th to 20th of Jan.