First off, it's incorrect to state that you have to be a citizen of or "live in" the States to be the registrant of a .us. And it's a stretch to say you have to have your whois data "validated" - I've dealt with different registrars and I've *never* been questioned about a .us registration. Unlike some country code TLD's (.ca I'm looking at you), .us doesn't seem to police their nexus requirements much.
Second, I've seen a lot of threads about the supposed value or lack thereof of alternate TLD's (e.g. ccTLD's, .info, etc.). Yeah, com/net/org are the big time, but here's something anecdotal to ponder. My S.O. got a best of Eric Clapton CD set the other day. I noticed an official EC fan club insert in the packaging and glanced at it. Guess what TLD Clapton's official fan club uses?
.cc
That's right - a TLD that I generally thought of as a ghetto TLD. Now, you may or may not be a fan of Clapton (I really liked him until the Tears In Heaven and Layla Unplugged tracks saturated the airwaves), but he has a business empire and chose a relatively short domain name on a ccTLD. Food for thought in my book.
So I'd say go for the .us, use standard tactics to SEO and promote it, and see what happens.