If you want something that is priced at the same level you will only get the same problem you have now. A good example when I worked in the auto mechanics we would see a lot of cheap domestic cars ie sunfires and cavaliers. You see auto manufactures would sell you a cheap car, but make it so that you would be back every 25000 km's for brakes and other things. They made their money not on the sale of the car, but selling you parts and service later. These cheap pressure washers are throw away in terms of when things break they figure you will throw it out rather then fix it. If you were to pay twice as much, but have easy access to parts and service would you not make up the extra cost of the pressure washer in time down?
You could also say I can buy 2 and have a backup. Only problem is that unless you carry the backup with you everywhere you could easily lose a couple hours going to get it to replace the first one.
I don't follow 120v pressure washers as I need a lot more then what they can offer. I do build all my own pressure washers though and I build them so that I can get parts and fix them on the fly. This means researching pumps, motors, rebuild kits, unloaders, frames, everything that could break on you.
One other idea have you ever though of just replacing the pump with something with better access to parts?
Good luck I hope you find what you are looking for.