I have the compact Karcher, model SC1122 (two or three years old now).
(1400W, 3.0 bar, 1.2 litre capacity - mine's a 240V model)
I'm very pleased with it. Came with a range of tools/fittings/accessories, although I've mostly only used the "jet-nozzle" and it's always been powerful enough for the domestic tasks I've encountered. Have also used it on occasion to clean a car engine bay or drive train before working on it (though to be fair, I usually only mess with small vehicles - typically race cars - and they are not exactly filthy to start with...).
I had wondered if the 1.2 litre capacity would be a bit small, but unless you are using this for commercial or industrial tasks, 1 litre of water does makes one heck of lot of steam...
It's nicely made and finished, seems to be robust; the plastic two-part tubes are pleasingly well-made and very sturdy.
Size-wise, the whole kit very very nearly fits into a SYS-5 (I don't have one to try, but going by the measurements, it's so close I'm tempted to buy a SYS-5 just to try it...!