He may be quoting the Preview file size in that 200GB. My Previews were up to about 100GB at one point before I killed the file and started growing it again with just my new imports. The reason is that I transfer the Catalogue and Previews to my smaller 12rMB for travel and transferring the giant Preview file is a PITA.
Back to the buying decision, I still haven't placed my order (sucks to be in Canada these days with our $) but this is what I'm probably going to get:
4GHZ i7
8GB RAM wich I will add another 16 or 24GB to aftermarket
4GB G395X (this is my one hesitation), maybe will just get the 2GB 395
512GB SSD (I have this size in my rMB and rMBP and like this price point)
Magic Trackpad 2 (will stick with my Magic Mouse from 2009 iMac as it is not a favourite of mine and newer one seems to be almost the same)
That comes to just over $4000CDN so an expensive beast but similar to what I paid in 2009. However, getting a 5K display in that price makes it more reasonable I guess....
And can someone confirm that the 5K iMac can run my 2009 iMac in TDP as my second screen? Thanks?
Any more opinions on the 395 vs 395X for LR use? I guess hard to predict LR's future with respect to Graphics use.