The Greek Goddesses have chosen you at random to settle which one is the best. Which ever one you chose will become your personal goddess and bless you according to her nature. What you do after that is up to you.
Why pick magic over a harem? There's a possibility one of those girls have magical powers, and so you could command them to use that shit for some sweet sweet lovin'.
>>8 inb4 not letting them know you are as smart as you are since you know everything (including acting) and using everything you need to know to make a successfull harem.
Hm..I can't decide between Hecate or Athena..because if I picked Athena I would be smart and would still be able to make a harem..but if I chose Hecate then I could charm women into becoming harem women. I want to talk with mah relatives from the dead. Or a Spartan warrior.