I ordered right as the store went live; I opted to stick with 2TB internal and only 128GB of RAM as this will be attached to multiple terabytes of external storage and the existing 128GB M1 Ultra this will be supplementing (not replacing; this replaces a 2019 Mac Pro) never hits the 128GB of RAM limit in our work or even comes close. Running through setup right now and then I'm going to do some comparative benchmarking in real-world applications.