As expected the Hexacore Mac Pro will take 4x 8GB DIMMS, giving 32GB, despite Apple insisting it will only take 16GB total. Mine arrives tomorrow! This news makes the hexacore machine the best choice as it has the fastest clock speed and still has 12 virtual cores. Few applications will be able to make the most of any more.
I will be building my machine over the weekend with 1 Solid state drive partitioned as the system and scratch disk, and 4x 2TB drives for photo storage and backup. I’m expecting a “dramatic” improvement over my 2007 MacBook Pro 17″ 2.4 Ghz. Updates to follow.