Well your needs seem to be oriented towards just getting a medium grit final finish. This may change over time. For most of the steels you mention waterstones are ideal, but when you work with abrasion resistant steels like s30v, consider diamonds. For this I recommend an Atoma 140 and if your budget allows a 400 Atoma. From there something like the 150 bamboo if you skip the 400 Atoma or a 400 Bamboo if you include the Atoma 400 is ideal. Jumping from the 150 Bamboo to the 2k green brick is too big of a jump for all but the softest of steels. While the 150 Bamboo is quite aggressive and would work well for the other steels mentioned, for s30v it won't be enough without some diamonds to start off. I'd also add the 1k Speckled Ume Medium stone to your lineup so you will spend much less time on the green brick, which is not a particularly aggressive stone.
The Nubatamas have lots of choices to adapt to lots of circumstances
If you need to do major repairs, grits below 150 are quite useful.