200 sounds too much, probably 130 only, if normally consumes 200 w in the suspend to ram it should use 15 w to 20 w
it is something like 10 to 1
the mainboard, ram and cpu(cpu in lower consumption state, saving lots of power) remains active, video card too, only network, sound card and similar stuff goes to sleep, cdrom and hard disk sort of sleeps too(cdrom could be just off, depends on the model and specs)
"As far as suspend to disk, I assume you can the disconnect the mains and move the computer to other position?"
mains? disconnect it from the wall? afik yes, it is in power off state
in suspend to disk, it is for the life of the hard disk, in ram, until there is no more electricity form wall or batteries, it can be around in this state(a laptop)for 5 to 6 hours
"What I mean by power outage is the the local power grid shuts down and one cannot even boil water for a cuppa."
you need a ups like this for this situationshttp://en.wikipedia.org/wiki/Uninterruptible_power_supplyhttp://www.apc.com/products/family/index.cfm?id=22
for 1 or two pcs you can get a 600w unit, it will provide power for 10 to 15+ minutes depending on the consumption of the pc(s) you have connected to it
this gives you enough time to shut down properly the pc, these units will work very well for 3 to 5 years and then it will be necessary to change the battery inside r replace the whole unit
remember that suspend to ram or suspend to disc requires time to be applied and a power outage won't warn you 5 minutes before