Shorty, I've just bought a new steamer, my old one I had for 10 years and it was at least that old again when I bought it. No brand name or parts etc.
I settled for a DE4002 from Karcher. I looked at most models available (stuff all) and it was the most robust. So many say like Richard did, they get a year or two out of a machine, I wanted another 10 year run.
I use it primarily for my mill warranty work so only use the one large hear with a single row or jets down the centre line. I'll have to check to see what other options it came with.
One thing I don't like, but is a safety thing is its a trigger activation without a lock, so for me doing heaps of steaming, the old hand starts aching after half an hour or more of use. My old one had an electrical on/off switch. This one does have a regulator on the handle though which is handle to increase or decrease steam.
Cost me $1800.00 so not cheap, but the cheap plastic ones from other brands were still only half that if not more.
John