Hi all, I'm looking to upgrade to a 5K imac very soon (up from 2008 Mac Pro ) and would like your advice on which of the following should have priority (in what order) if my main usage for the imac is photo editing (big files on CS and Lightroom): 1. CPU 2. RAM (will buy the 8Gb, upgrade to (likely) 24Gb from 3rd party). 3. Storage (which will be SSD only 512Gb) 4. GPU Will go for the top model but am doubting whether or not to invest in either a GPU or CPU bump, or perhaps even 24=>32Gb RAM. Thanks a lot!