I was inspired to do this by one of my favorite artists in the comic book world, Ed Benes. This is an homage to his 6.5 Supergirls illustration and to him.
You can see some of his god-like artwork here on DA at [link]

Now from left to right we got "the"Batgirl, Alicia Silverstone, "nananana" 1960's same bat time same bat channel Batgirl, Cassandra Cain(the coolest looker of'm all), Barbra Gordon from TAS, Barbra Gordon aka the Oracle and the last on the end Batwoman(who has the batman beyond symbol, my personal fav. symbol)
Now i know i wrote 6.5 cause technically oracle isn't really batgirl anymore, BUT it's really more like 4.5 cause "the" batgirl and alicia suck. but thats just my opinion...your open to your own...