I bought this 27" retina iMac at Xmas but i only got mine with 8gigs ram figuring that I would upgrade at a later date.
I am an average user, mostly on the internet although i do often have 2 browsers open with about 16 tabs going at once, email, and a few others and never once have i run into a ram problem, even when all of that and converting a film from .mkv to .mpg
so not sure why everyone feels the need for 16-32 rams straight out of the box but i guess at some point i will upgrade
Because you can ?
Coming from Windows, I plan to run Windows 8.1 in a VM for some apps I don't see a replacement straight away. 8 GB sounds a bit tight to me, so 16 GB seems to be more safe.