Ordered 5k iMac
Just thought I'd share a few thoughts on my buying decision.
This was all about the display for me. Primarily, I am a graphic designer working with type. It's been more print based work lately - with a non retina screen I really struggle to get an idea of what text weight/kerning/etc is really going to look like when its printed - this will hopefully give me a clearer view of the work. That being said, I also work in after effects / premier pro for a few projects every year. I don't really do 4k level work, so the screen is less of an advantage for me here. And of course, some heavy photography/photoshop work comes with most projects.
My main concern has been screen lag. I see a lot of comments harping on the video card. This made me second guess purchasing first gen. However, I can't remember an iMac release where people didn't complain about the video card. This seems to be from people who use their machines for 3d games, I'd love to play them, but in reality I just don't make time for it. And from what I have seen in the hands-on video, this machine can rip through images and video without stutter - great, this is what I need, not a high-end 3d machine.
I ordered: 4Ghz processor - no-brainer for the price. 4GB video - again, no-brainer. 8GB RAM - was tempted by the 16GB option since the price is comparable to 3rd party, however I want 32GB and apple charges too much for that, so I will order 3rd party later. Hardest decision for me was storage. I love the idea of all Flash storage, can't stomach the price of apples 1GB Flash drive, wanted more than 256GB or 500GB, so I opted for the 1TB fusion - I use that currently and it's totally fine, never noticed a delay. I primarily work off of external storage.
Hope this helps others.