What is a good size pressure washer for home use?

The most versatile category of pressure washers, those ranging from 2,000 to 3,200 PSI effectively clean cars (including the most well-used off-road vehicles), home siding, fences, boats and grimy garage floors. Those closer to 3,200 PSI work effectively on tough stains, too. Is a 2000 psi pressure washer good for driveways? To clean concrete effectively,…