Depends on your style but scott said it right..
Here is my quiz.. Question Thingy that helps you decide...
#1.Do you like sharp open games or positional games?
#2. Do you want to have an opening that has a good "study to results" ratio, or do you want to imediately pursue a complex position?
If you want a good study/results ratio and positional, pirc, carokann,
If you want a good study/results and sharp... Scandinavian, E5
If you dont care about studying but want results, against Dpawn Benoni, Epawn, sicilian
But mostly do what you are comfortable with and you'll do fine
Robbie
what is the beat opening for black to take away the advantage for white