1. Dr. Mid-Nite and Black Canary.
Finally, Black Canary was having a relationship with someone respectable, and they were forced to pull the plug on it when Jackass Queen came back to life. Now that she's in Mama Mode with, oh, whatever that kid's name is, bringing a stable male character back into her life is a good idea.
2. Arsenal and Huntress.
Now that Brad's had the opportunity make his "pretty bird" joke, Hawkman'll come back in a month or so and punch him in the face. Besides, what would Hawkgirl see in a jerk like Arsenal? Arsenal and Huntress are a natural couple with their faux-rebellious streaks and it would provide a sensible opportunity to bring Huntress into the Arrow Family where she belongs.
3. Batwoman and Etta Candy.
Fabulous Kate Kane needs to stop slumming and be detached from Scary Alcoholic Mess Renee Montoya. We know that Etta Candy Whom No Man Can Possess is coming back, and while a pairing between the two may seem unlikely at first blush, I maintain that anyone who fights crime in red heels has got to have a sense of humor and would hit it off famously with Etta. Woo woo!
4. Ryan Choi and Nanette Phaedon.
Nanette Phaedon hasn't appeared in the All-Nude Atom yet; she debuted in Firestorm #22 (the issue where Firestorm became cool). Due to some wacky Firestormy encounter, she can shrink (or is permanently shrunken, I'm not sure which)! What could be more natural than to have her seek out the Atom to get -- or give -- some advice? And perhaps some teeny weeny companionship?
After all, we know Ryan likes forceful women like Nanette and, face it, his relationship with Dr. Zuel isn't a keeper.
5. Aquaman and Esther Maris.
I mean the real Aquaman, of course. Esther Maris is the science reporter who Aquaman became intimate with during Arcudi's run.