Mine is whining like a supercharger at 6k RPM running 20 PSI.. and its getting annoying.. so i went to the parts store and bought a *NEW* water pump.. brand new.. for 22 dollars.. yes, i said twenty two dollars, and with a lifetime warranty.
from what i can see, all you need is to take the belt off the pully, un bolt the pully (4 little bolts).. take off the pump itself (5 little bolts.. gotta drain the coolant, too) pop the new one in, replace the 5 bolts, put the pully and 4 bolts back on, and put the belt back over the pully.. and fill it up with coolant (and let the engine run for a while with the cap off the reservoir.. this will let the air out of the system) and voila! i just replaced the power steering pump.. and this is looking to be ALOT easier than that.. dont take it to a shop