Lisally~
It definitely is all about your ability to afford membership in two GLO's-- both financially and timewise. Before you decide to join a second organization, take a look at your classload now, as well as what it's going to be in the next couple semesters, and evaluate if you can do it.
It's a lot of juggling... but if your schedule will allow it, I say go for it. Just remember that you don't want Greek commitments to affect your education-- which is why you're there in the first place.
Good luck!
~ Mel.