I'm a bit late to the party, but after a lot of huffing and puffing I gritted my teeth and bought a Kranzle - their K10 model. It was around £500 (ouch!) including their "dirt killer" whirligig lance. I got it from direct from a supplier in Germany at a significant saving, albeit had to put a UK plug on it.
Despite what seems a horrific price, it really is in a different league from the ones you get in B&Q and is very much a "pro" model - seemingly about the cheapest you can get a proper pro machin. The lance is mostly made of metal with brass connectors rather than plastic and to put in perspective I subsequently bought an adjustable jet lance for it for another £70 which is the same price as a complete cheap machine from B&Q - but there's a reason for that ! The machine a beast and works incredibly well. In retrospect, I'd buy their otherwise identical K7, which is the same pressure but slightly less volume of water and also able to suck up water from a tank or bucket. If you can stomach the price, an awsome machine
