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I'mthinking of doing the same - although just going 32gb on memory. Amazing that for the same 8gb-16gb upgrade on Apple's site ($200) you can go from 7gb -> 32GB using OWC. So glad Apple has user-replaceable memory on the 27" 5K iMacs!

Last generation I fear, so enjoy.
 
I've just been onto eBay and gone for the mid-tier iMac 27" mid-2015 model.

Granted it's not the one released last October but I managed to redeem some Nectar points and paid just over £900 for it.

Would've waited to see what Apple announced in the near future but wanted an iMac again after using my late 2014 Mac Mini.

Managed to get £163 for it which I'm happy enough with.
 
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