Very good points! I'll just comment on bandwidth and subscription, while rest goes straight on my todo list. The idea was it will be less used than other settings and I didn't want to scare people with too many settings at first ... and it was scary with 7 sliders. So at first I've just put the used values, but later did the expanding panel. Will see how many people really use it. I'm just worry not to overload it. I remember when I saw EC2 calculator for the first time - I felt really overwhelmed.

Edit: By "used values" I mean bandwidth values that where used for calculation. They were to be static. So later I came up with this solution to be somewhere in the middle.