I just got the Dewalt 3800 PSI unit from Homedepot and its really nice. Honda GX270 and a triplex pump made by Comet in italy on mine. CHECK THE PUMP before buying. Sams has the same unit (Simpson Branded) but its got a CHINA pump on it. I think Simpson makes these with Dewalts name.
When buying a PW you are really buying only two things, an engine and a pump, and you get what you pay for. So if its a nice triplex pump and a reputable engine, snatch it up.
Buy plenty of GPM, it cleans faster. I wish i had more stuff to clean since its really fun to fire up this beast.