To me, RAM is often the best choice anyone can make when choosing what to upgrade. I've done this in every single computer I've ever purchased and its allowed me to get a few extra years out of a machine I otherwise would of had to dispose of because RAM requirements tend to increase over time. It's a great way of future proofing your purchase.
To me, upgrading to 32 from 16 instead of the smaller upgrade price of i5 to i7 makes so much more sense. Sure the RAM is a pricier upgrade but relative to the overall price of the machine and the extra few years you might get out of it, well worth it in my opinion.
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Perhaps they are now working on the 32GB RAM models and getting those ready to ship. Mine is also the i5 with 32 but 512GB storage.