Check out Sebastian Lester's Soho Ultra Italic Pro.

Do you need a true italic or will obliquing FF Extra do?

Oblique is fine. It is going to be one word, set in all caps, so it really doesn't matter.

BTW, this is for the signature of a Trademark so, Stephen, Extra is a little too on the wild side. It still needs to be readable.

Also, right now the best contender is Morgan Sans Black.

Ahh, ok, that helps clarify things. I assume you mean Morgan Big Black?

Check out Tankard's Shire Types.
http://www.typography.net/type/shires.htm

hhp

Yeah, Morgan Big Black Italic. Sorry.

Digital Sans Bold Italic
FF Matinee Gothic
FF Flava
FF Soul
FF Beekman

Just stumbled across RXC's Phalanx.

Maple Black Italic?
http://www.processtypefoundry.com/typefaces/maple/index.html