Pressure Washers

Bosch (Aquatak) - German brand. popular in UK and Europe.
Makita (Aquamak) - Japan brand. trusted manufacturer of power tools.
Karcher - German brand. specializes in cleaning equipment. popular in USA.
Nilfisk - Denmark brand. specializes in cleaning equipment. popular in Europe.
Skil - lower division of Bosch.

If main use is for washing car, it is quite fine to get an entry-level model. If you plan to do some heavy cleaning, a higher pressure model will be more suited.

95-110 bar (1350-1600 psi) - Entry level. For light cleaning, car washing, window cleaning, bicycle cleaning, etc.
110-120 bar (1600-1750 psi) - For a bit more challenging jobs like cleaning garage floor and driveways.
140 bar (2000 psi) - For more difficult jobs like removing moss and stains from patios, decking and garden walls.
160 bar (2350 psi) - Semi-pro level. For tackling the toughest jobs and fastest cleaning.