AC - when turned off maybe 2HP at the most - it's just another idler pulley until you turn on the A/C, also, when you go to WOT the comp shuts off the A/C.
Smog Pump - 1-2 HP
Water Pump - up to 12 HP according to manufacture.
Power Steering - don't know.
i've been running the Meziere electric WP with idler pulley since early 2005 in my 94 GT out in AZ with NO problems. (it's the proto-type for the 94-95 GTs)
it's suppose to draw about 10-12 amps.