Keep Batgirl, Black Canary, and Katanna. Scrap all of the rest.
Then maybe add Fire and Ice.
And even though this won't happen due to the current state of the DC Universe, Renee Montoya's Question and Helena Betrinelli's Huntress would be my ideal additions to the team.
While dangerous, even slightly groundbreaking, adding Raven to this team of street-level covert-ops team could open up some new venues of stories to tell with it.
It's dangerous in the sense that normally this book is read because the girls in it kick ass in the physical sort of way, they are really good at that, but not superhuman. Raven however is not a character that's been shown to leave her superpowers at the door in favor of fists and feet.
It's groundbreaking in the other way since I can't recall the team ever having a magician on their team for any length of time. That said, I wouldn't want to escalate the team to take on demons like Neron or Trigon, mad cultist perhaps, but not the big shots of Hell.
That said, I would honestly have preferred if Raven had appeared on the old team, simply due to it's greater level of experience and more solid core. Since it would be something new for her character, it would broaden her sphere of contacts and perhaps someone could finally figure out to make something interesting with her without having to add her father. Also it could be amusing having her and Huntress under the same roof.
Pre-52, Power Girl would have been a great addition because she has past animostity with Oracle due to a failed mission. If they could write in a similar backstory, it would work quite well. But I dunno, I haven't been reading n52 BoP, so I don't know if the team was around before or if Oracle (if Babs was ever Oracle) was ever leader of the team.
Vixen for Justice League please.
Is this DC's only female team? "Birds" has always been the draw back of the team.
Bumblebee could fit. It would introduce her to the new52. She's an intelligent and a gadget engineer. She built her own power suit. That could be expounded upon.