If you can bring the budget up to 500-600 you can get a pressure washer with triplex pump and Honda engine. This combo will make the unit last for ages and ages. The Generac onewash and troy bilt mentioned above both have axial cam pumps which rotate with the engine shaft (high speed) and will wear down much sooner than triplex which is crankshaft driven.
The one I'd recommend is the Simpson Cleaning brand with 3,200 PSI, 2.8 GPM and Honda GX200 engine and CAT triplex plunger pump. It looks to be $500 on Amazon and model is ALH3228-S if you want to search around that will be your best bet and bang for the buck.
Cheers