Its a matter of opinion, but i personally love how shirogami reacts to a soaking stone, on something like your king 1000, the feel is great.
The shapton pro 1k/5k is the easy choise, no doubt.
Shapton pro are some of the harder and slower wearing, but still fast cutting stones out there. They are also some of the more robust stones out there when it comes to drying, they are not very sensitive as some other stones. Generally they are supposed to be very balanced.
I don't remember the technical aspect very well, but they are supposed to be a better pairing with stainless knives then soaking stones, when it comes down to wear and feel. Which could be relevant unless you practically only sharpen your carbon knives.
Your intuitions on the wear of the steel are good, eventually you will want to invest in a low grit stone, for thinning and stubborn knives you decide to sharpen for family and freinds