As with all closed loop coolers and watercooling in general, coolest air is best, even if that goes against conventional airflow design; you just might need to alter it a bit. Otherwise, if your case has great airflow anyway, fan direction shouldn't matter much. Make sure you are aware if your case actually has great airflow...just because the box or website says it does, that doesn't mean it's necessarily the truth.
Thanks rubix! I'll take a look into that, but im guessing my best bet is to just mess around with the setup.