i have a 5 year old northern with the gx160. we use it to wash the fleet year round. probably have about 40 different guys using it and it still holds up. I have trained the guys to let the water flow thru the pump and hose before they start the engine.
I was looking for one for my house and what i understand is the gc engine is lighter duty, the gx's are commercial.
569 isnt too bad. i paid about 400 5+ years ago with a national account.