Guessing that you want something relatively quiet, I'm thinking you are heading towards an electric washer. Depending on what you are mostly going to be doing with it makes a difference & also whether or not you want/need something mobile.
I have always had a good run out of Karcher pressure washers, be it gas, electric, heated or cold. Karcher make a really nice wall mounted unit too if a mobile machine isn't necessary.
Another great brand that is more so on the commercial/industrial side of machines is TechnoMech. At our shop I use a TechnoMech pressure washer that is electric with a diesel burner for heating the water. It has adjustable heat & pressure & also a chemical tank to add your favourite foam/soap that at a turn of a switch, will run through the pressure lance. Also sports a Bertolini ceramic pump which have bulletproof reliability.
Budget, uses, hot/cold, electric/gas, fixed/mobile are all factors to consider. Hope I helped in some way, happy shopping.
Aaryn NZ. :dblthumb2: