As told by my NRD in seattle, competitve for SNA/SNFO is a 55 for your OAR and 6's for the rest. However, do not let that OAR bug you if you have a good package. GPA, LOR's and extracurriculars can make a huge difference.
My Stats
OAR -49
7/8/7 AQR/PFAR/FOFAR
3.8 GPA in a non technical degree and 3 SOLID LOR's.
I got picked up my first time around. From my experience, and I have been told this by the O-6 that gave me a LOR, showing persistance and the willingness to achieve the goal is key. Hope that helps some.
vr/
Josh