Lucy24, is that General Delivery, or something else? I think it won't work for me because you HAVE to use your real legal name, and I also want to shield that from con artists and scammers.
From what I've been able to determine: WhoIs does not require an actual person's name. Some privacy services will even leave out the person's name if there's an organization/company listed.
I'm in email consultation with a virtual mailbox provider. Looks like they will accept mail sent to something like "Domain Owner, Domain Name, [address]" as long as people include the suite number that's assigned to my specific virtual "mailbox." So I think I'll just go that route, and get a virtual phone number, and hope for the best. I plan on moving to a state where it's not heart-stoppingly expensive to incorporate by next year at the latest, so then I can change everything over to the corporation, get a PO box for it and move on with my life.