Hi all,
Well, it would be advantageous to be someting relatively long-lived, so, unfortunately, the Old World warblers would be out, despite being one of my favourite groups. Also, there would be no real point in belonging to a species as globally endangered as, say, Zino's Petrel, as it would be hard to get some 'action' (though, on the other hand, a male Zino's would be quite desirable to the females if there is a surplus of the latter). Posing an ID problem would also appeal, so there would be no point in being anything too obvious either!
Maybe one of the Lesser Spotted/ Greater Spotted/ Steppe/ Tawny Eagle group, or a large falcon, or a Pterodroma with a relatively large population (not Soft-plumaged, though, as they are too easy to ID!)....