You can't buy a brand new, GOOD, pressure washer for $400. Adequate, decent, sufficient, sure (depending on need), but you won't find quality at that price. So a lot depends on your usage and what you want to get out of it.
Last year I did a ton of research to find what was best. I was looking to buy a new Pressure Pro, but keep an eye on CL if you don't mind buying used. Keep an eye out for a belt drive pump. I ended up with a Mi-T-M 4 gal 4000 psi, v-twin Vanguard engine with battery start that's 15 years old but will last forever. Great USA brand. Also "some" of the Ridgid higher-end units with Subaru Robin engines and idle-down and CAT pumps looked pretty good, but I think they were double what you want to pay and I'm not sure if they've update the model lines (there was some trouble finding the specific unit I wanted when I was looking, it was either discontinued or just release, but supply was low).
Cat, AR, Comet all make good pumps. Put a filter in front of it. If you're set on a Honda engine be aware there is the "cheap" version, the GC, and a higher quality model, the GX series. Other quality choices are the Subaru-Robin EX series and B&S Vanguard series. Combine any of those pumps with any of those engines and you've got a pretty decent machine. For more durability, upgrade to a belt-drive pump and now you've got a good machine. The important thing to remember is, if you're not spraying, TURN THE ENGINE OFF. Excessive idling will cook the bearings in no time on a direct drive pump. Second most important thing to remember is, don't lend it to anybody for any reason.
For $400 I'd go with the Pressure-Pro HC2500HA, do a search and you can find it online for under $400. Should last a good while with light-medium usage. Or a bit more for the Mi-T-M CM-2600-0MLB.