The pump as mentioned is the big deal, change the oil, engine & pump.
Reading skfarmer's post we have the same machine.
If I were in close proximity to Phil I would, be looking at what he sells. Not being there Notherntool was the choice.
This will give you all you need last for long time....
https://www.northerntool.com/shop/tools/product_200788684_200788684Some things to consider
1st choice>Honda power,
Briggs & Stratton <<< the short version BS fits perfectly. Unless they have made huge changes run like hell, Purchased one years back, returned it the next day.
Grew up with the name and it had a good one, cannot say the same today .02
As for the extras...
Buy another host double the length,
Second, not required an offloader valve, bypassing the high pressure to the hose when motor is at idle.
https://www.northerntool.com/shop/tools/product_21815_21815Do not buy a surface washer, idea looks better than it works. I've considered them, after watching the videos. Good old wand & and the right patterned tip is faster, and takes up less room.