If I'm not mistaken the Nilfisks have metal impellers which should theoretically mean they last longer. I've got a k2 and find it's more than adequate. (I've used it to successfully strip flesh from my thumb!).
Full control is the one with the jazzy dials? I didn't see the point in this and opted for the normal version. I've used it for car cleaning duties, washing decking, wheely bins, stripping masonry paint... and have never found it lacking.
It's also fairly common so it will be easy to find snow foam attachments etc for it.