That looks good.
For the wash I'm going to change it to Adam's soap because it's just simple and really cheap and easy to use, you can't go wrong with it:
In the foam cannon you can use the Adam's foam which works really good:
Adam's detail spray is another super easy to use product, just spray it on the car before you wipe it with the drying towel:
Foam cannon if you can do this one, I can't remember the cheaper one I've seen in reviews right now. But this one will last forever basically anyway. You want to put the larger orifice in it that comes with it:
The only thing with the Ryobi pressure washer is that I don't know the gallons per minute with the nozzle set. I know the Karcher 1700 is better than the ryobi and if you get the 3.0 gpm nozzles it'll do 1.4 gallons per minute at 900-1000 psi which is right where you want it.
If you want to go with the ryobi look up the videos from obsessed garage where he tests all the models and shows which nozzle to buy for it to get the right pressure and gpm.