Your condensor is ****ed. Mine is too. Been like that since last year. A/C still works fine though.
honestly, dont use A/C in the city. Your car is slow enough thanks to the auto tranny(lol, j/k).
On the highway, you wont notice the sound, and you'll get better gas mileage with the A/C on than the windows down, so crack the A/C up, turn the "recirculate air" button on, and enjoy the freezing cold air.
When it goes, you need a new condensor, they're not cheap
The RPM's aren't anything to worry about, the computer wont let the car stall out cause of A/C (at least it shouldn't, if it does something is really ****ed)