I have an M1 Max Studio and it gets the job done but I want to upgrade to the M5 when it comes out. I suspect that it will be a case of placing an order and waiting 1, 2, 3, 4, 5, 6 months to get it. I looked around at the M4 and it's as people say - you can't get them.
I've looked at building a PC and parts are available but the prices are crazy. It would also take several hours to do the build although I find it a fun task; just need to allocate the time. I can go either way. Right now I'm using an iMac Pro (cheap) and the M1 Max Studio and these work fairly well. I wish that I had more RAM on the Studio (48 would be enough) but I can split my applications between the two systems running stuff that doesn't require much CPU on the iMac Pro and stuff that needs more performance on the Studio.
It is nice to have hardware that is good enough at this time. It is completely possible that hardware gets even harder to buy later this year and into 2027. We're all being held hostage by the Iran war and the potential effects on the consumer electronics marketplace.