The big unit you mentioned at the start is overkill.
I have a $60 Harbor Frieght that is at least 8 years old, would guess it has close to 500+ hours on it. Only thing I have done is replace the electrical plug.
Have another one I picked up at Aldi's, three years ago as it was on sale for $79, thought a back up would be good to have at that price.
My buddy and partner in Grumpy's Garage took it to his house and has ran it about 15 hours cleaning his siding, etc.
Both little, cheap, electric units have done fine.
That said, one never knows just how long one will last, I guess for once in my life I got lucky on these units.
You sure don't need all that pressure of the Honda or any of those for what you will use them for, since those cars don't get real dirty, etc. (ps, you are my hero, love the Aston-if had the extra cash would own one)
Something to consider, if your home has good water pressure, pick up one of those "fire hose" nozzles.
They are great!!!
Can adjust to a good power stream, and for rinsing to a "flood" setting.
I gave one of mine to my boat club for members that wash their boats when they are done with their run in the Muddy Mississippi.
Cuts their wash and "rinse" time by 2/3rds.
The gal we have for facility maintance was using a pressure washer to wash off the concrete apron, and such, large area.
Showed her the fire nozzle, she thought I was full of BS, but let me go ahead.
Now, she only hooks up the electric pressure washer once in a while when the may flies hatch.
Says the hose nozzle saves her tons of time.
Just a thought.
Grumpy