i always press z, x, c, s, 1, <enter> and shift+w to save. I used to color code different servers, but there's only so many combos (like 5) that are easy to read.
And htop is still good enough.
I like the idea of having IO integrated. I have trouble remembering the iotop flags and often run it in a parallel window.
htop shows IO usage too if your version is recent enough. Tab.