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My recommended iMac 5K is now $400 off through May 25. One caveat: for my own needs I need a 2TB SSD and that one is not on sale. But most users will find a 1TB SSD more than adequate plus many high performance external Thunderbolt 3 SSDs are now available. Add 64GB OWC memory, and this is as good as any iMac Pro for most photographic tasks, and sometimes faster.
For iMac Pro deals, 32GB memory and 1TB SSD will serve most users very well, and 8 cores are the sweet spot for price/performance.
For 2017 MacBook Pro deals, I recommend no less than a 512GB SSD (1TB for photographers), but for some users 256GB is enough, and OWC has a very nice and relatively inexpensive 1TB Thunderbolt 3 SSD for under $500.
With the 13-inch MacBook Pro, I prefer it without the trackbar nuisance. An 8GB / 256GB model is fine for school use, and a bargain at $1099.