Barbara (Batgirl) Gordon and Jason Bard (anybody else remember him?). It could work a lot like Black Canary's late-Golden Age scenario with Larry Lance (back when her last name was Drake).
Even tho I'm firmly a Superman+Lois/Wonder Woman+Trevor guy, I have to admit that a Lois/Trevor relationship has potential for a political-thriller/noir-crime mini-series, or even on-going backup.