budget 500 max with all perihpals without the os
needs monitor and keyboard and mouse
What is this build going to be used for?
yup hard to get parts without that .. also - any brand preferences
As mentioned, we'll need to know what it will be used for before we can offer a really good recommendation, but by "home desktop" I'm assuming it would be used for general home office and entertainment needs. If that's the case, something like this might fit the bill:
PCPartPicker part list / Price breakdown by merchant