I'm very interested in what your criteria is for your perfect shaving bowl!As for bowls, I still have regrets as I did not find one which really ticks all my criteria's. I am thinking to ask a customer maker to make the one I have in mind, even if I have to pay a few hundreds (or a thousand) bucks for it.
If I were to buy a new bowl today, it would either be one of the copper bowls from Captain's Choice or this ceramic bowl by Hwayeon Soap Co.
I currently use a ~$4 cat bowl from Walmart, mostly to load soft soaps for face lathering.