I went big on the M3 generation so I should be good for a few years - therefore thinking I'll likely upgrade in 26 when it seems like we'll be getting a redesign and tandem OLED. I do a ton of photo/video work and have been extremely impressed by the tandem OLED screen on the new iPad Pros, I'd also love TB5 as I'm hoping Apple will release an update to the Pro Display XDR in the next couple of years (again with tandem OLED, 120hz, 7/8k resolution).
My only issue is that the resale for the higher end BTO options are always pretty rubbish compared to the price you paid - so I'm hoping its 2026 to give me more time to save up 😀