Thanks for the reply! Yeah, I appreciate there’s an refresh coming soon...although we don’t know how long that is could be beginning of the year, could be after, right?
Also there’s the fact they could decide to take away the slot for upgradable ram on the 27” so I’d rather get the current to be honest.
... also, I would NEVER suggest that anyone doing high end graphics work ever buy a new Mac during the first ~3 months after the release of a new OS release. You need to give Apple, Adobe, and others some time to ferret out and fix the various issues that the new OS introduces.
Like the others, I recommend a large display (if you can't afford 2 large displays) and a lot of RAM. Also, opt for a better GPU and then up the processor. I also suggest at least 512gb internal SSD and several external drives (TimeMachine, primary image storage, and 2 for alternating offside backups).
At work I do major photo editing for an art photographer. I use Lr and Ps heavily. My Ps PSB format master files are generally in the 1-10gb range with 1-2 Smart Objects and 5-30 adjustment and retouch layers. My 2015 27" iMac with 1tb SSD, 32gb RAM, and the fastest i7 and top GPU available at the time is quite functional, but some of my files do take up to a minute to "render" when I edit the Filter on a Smart Object. Ps also often lags with painting on a mask for one of those Filters. It was the most powerful iMac available 2 years ago and the new ones are only slightly better. I have an older Cinema Display attached as a second monitor for displaying Finder windows and other things.
I frequently produce very large files for printing (48" x 96" at 300ppi and larger), and it is the layered PSB master files for these that strain Ps. When working on the small files needed for magazine and brochure work and the minuscule files need for Web use, my iMac flies.