Karcher use to make some pretty decent electric units. Not sure anymore. Depends upon how much pressure you need I guess. I think most of the Electrics top out around 2,000 psi..
I had borrowed a 1600 psi electric from a friend to do the deck once, wasn't really enough umphh..
Ended up buying a 2,600 psi Troybuilt With a Honda GC series Engine. Works pretty well, has required minimal upkeep, gets used once or twice a year, and is about 5 years old now. I try to always keep the gas on hand with stabilizer in it, and that seems to help alot..