I have a 2012 27" iMac. I've upgraded it to 500GB SSD and 16GB ram. I'm itching to get a 2017 iMac but I can't get much more than a 1TB fusion due to budget and having to go with a stock machine. I use the machine for some batch photo processing, a lot of web browsing and online web applications. What will the general speed of the machine be given that the SSD part of the fusion drive on the 1TB is so small? Am I better off sticking with the machine I have at the moment? the 5K display is what is enticing me at the moment. Thoughts? Side note: I also have a MBPTB 13" but thats just an on the go media machine for personal use.