[AngusH]

I'd probably want it grouped by category with a drill down interface for the specifics.

Probably arranged so you can type in a figure at the bottom for monthly expenditure and it would balance out the requirements based on typical use cases.

So enter $50 in the monthly cap figure and it allocates, say, $20 to compute, $20 to transfer operations and API calls, $10 to storage

which you could then fiddle with of course.

I can't offer much on the second point other than to say that unexpected bills annoy me much more than services that stop working.

I've also never worked anywhere with unlimited budgets. (alas)

I can see that there are probably cases where uptime is more important so they would be more annoyed the other way around.