My father in law has a Karcher 2 series. It sprung a leak (one of the internal plastic pipes split). I was able to fix it but when I was researching there is a better than even chance it will have some issues especially with leaks and you end up spending the more to fix the hoses, etc. They are just not that rugged nor designed to last..just occasional use. Never let water freeze in them. They do not repair them if they fail. If it fails on day 1, they will ship you a refurbished one..not a new one unless you squeal. There are many refurbs on ebay.
Since it has been fixed, I must admit it has worked for some time (several jobs - pressure washing the house, deck, etc).
I did some research and the minimum you should get is the Karcher 5 series with the induction motor. It runs around $270. You can get a refurbished one for less.