To answer your question jamminpuppet, Chuck Liddell is still the Lightheavyweight Champion and retained his title title in a recent victory over Renato Sobral. Chuck will be fighting Tito Ortiz in a rematch in Decemember.
Anyway, I think the next best fight for Swick has got to be Leben. Leben was quite possibly the number one or two contender before facing Anderson Silva, and now that he's rebounded with a win over Jorge Santiago, he's still in contention for the title. With Swick's victory over Loiseau, he's got to be one or two fights away from a title shot. The most logical fight would be Leben vs. Swick II.