4K iMac!!!

Whatever you do, get one with an SSD, or at least a fusion drive if at all possible. The standard HDD ones will make you bang your head to the desk waiting on it to catch up.

The screen will be a massive improvement over your 2011 iMac, but the i5 isn't going to be a huge leap over the Sandy Bridge chip in yours, but still a good bit faster and a lot more efficient, plus the Intel cards are going to be more reliable and even better than the AMD unit in yours.

I'd say go for it if you want one, just grab one with the SSD

5 years is a solid upgrade cycle too IMO. I went from my late 2008 MacBook straight to a late 2013 rMBP summer of 2014 and it was a substantial upgrade and well worth it in my book.

 

Well, then you've done well then

You may have read what many have been saying about the 4K Mac which I'll leave up to you to determine what I am referring to.

However, if you don't use a graphics card for anything (I don't either), the integrated graphics wouldn't matter I suppose.

That is easily the worst part about the 4K iMac. I'm being honest with you.

Now, you went with 16gb of RAM. That's good, because the RAM is absolutely not upgradable after purchase. If you buy one of the 4K ones with 8gb of ram, you've made a mistake.

The 4K also has two acceptable storage options: 256gb SSD or 2tb fusion.

You picked one of those, so again, you've done well with that.

Other than that it's a great machine if a smaller screen size is going to be better for you, and you won't be putting a graphics card to use.