$1800 off Apple 2022 Mac Studio M1 Ultra
The 2021 Mac Studio is a fantastic machine. Not quite as fast as the current Apple Mac Studio M2 Ultra but faster than any Mac you ever used before. The M1 Ultra is a lot faster (20 cores vs 10) on some things than the M1 Max. EG the stunningly impressive 2021 MacBook Pro M1 Max that I raved about on my recent trip.
I recommend a minimum of 64GB memory and 4TB internal SSD, 128GB memory preferred if you you do large jobs like I do (Photoshop, focus stacking, panoramas, etc). And of course memory-hungry Adobe Lightroom. I would strongly prefer 128GB memory over and 8TB-vs-4TB SSD for example because I can add storage but I cannot add memory. Still, 64GB memory will serve most everyone superbly well.
OWC
OWC regularly gets batches of new and used Macs and iPhones and iPads and offers them at deep discounts. Here are some great deals.
B&H Photo
Authorized Apple dealer B&H Photo is still blowing-out some great deals, like the fully loaded Mac Studio M1 Ultra. I would absolutely spend another $500 for 8TB vs 4TB SSD and/or 128GB vs 64GB memorty.