Time has flown by - the dress no longer fits, but it still has a prime spot in her wardrobe.
As far as Karchers are concerned, I would recommend the K2.9 as the lowest model in the range to consider for regular car washing and random other cleaning tasks around the home. It's a decent machine at a good price. Every now and then Game or Makro have them on special at +-R1K.
Don't bother with the Karcher foam nozzle. It does produce a bit of foam. but nothing like the foaming action you see across detailing forums around the world. Although it's a bit more pricey (+-R650), I recommend getting something like the one reviewed in this
link. It is excellent quality and performance to match and is what I have in my detailing arsenal.
As the detailing bug bites, you'll find yourself wanting more and more goodies and toys. My advice is to take it slow - don't try to build up a monster detailing kit overnight. Rather buy supplies and tools as you discover the need for them and over a period of time you'll put together a decent kit.