[Julius Jonas]

I am sorry, I obviously meant the 575 and 580.
And that has something to do with the standard storage option you get. For the 575 you get 1TB Fusion drive. He says he is getting a 2TB Fusion Drive, which would be standard for the 580. But if he wants to upgrade the 575 model to 2TB Fusion drive it would be cheaper to buy a 256GB SSD.

Also, you can pretty easily put your Logic library, Photos library and even iTunes if you really want to, onto an external storage.

https://www.youtube.com/watch?v=oRCXYXszi8U

I guess you might be right about the RAM, it must be different then between PCs and iMacs.

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[Julius Jonas]

Okay so:

Which model are you getting? Radeon 475 or 480?
If you get the 475 then do not buy the 2TB Fusion Drive if you get external storage anyway. If you get the 475, buy the cheaper 256 GB SSD plus your own external storage – just makes more sense to me.

If you get 8GB of Ram from Apple do not insert two sticks of 16 GB. I am not an expert on it, but someone can probably back me up on this: it is not good to use different sized RAM sticks.

So rather go for 4*8=32; that should be enough

Unless you want to take out the original one and then put for 16 GB in there or whatever…

[Julius Jonas]

Exactly,

when you would ONLY use Final Cut Pro X then you can “ignore” the processor, go for the best graphics card you can have, RAM is good as well. But of course, if you will use your iMac for various applications (multimedia production and “normal usage” like Mail, Safari,…) you will appreciate a good all-round machine. Depending on how much you want to spend, you will have to adapt your selections. If I were you, I’d go for the i7 processor and put your own RAM in it. For the graphics card, take the best one; the 5K Display needs power. And for SSD vs. Fusion Drive vs Hard Drive I have to say the following: I am working on a MacBook but have an iMac as well, so SSD vs. Hard Drive. The Hard Drive is just horrible. Go for the 256 GB SSD and buy a whatever RAID you want, you have all the options. Then you will have all your apps and important documents on your iMac with super high-speed. On the other side, you have all the big stuff like 4K footage on your external storage: Connect it via USB 3 or Thunderbolt and it will be fast enough for editing.
(I am working with a medium speed hard drive, just connected via USB 3 and it is fast enough. I also have an external 512GB SSD, which I sometimes use to get even faster performance – when loading projects or importing videos, the SSD outperformes the hard drive easily…)

And with that setup you should be able to do video editing and multimedia production, while you still get good performance on everything else you will do.