these are the groups that compete with each other

A lot of the girls that came to Zeta on pref round this last year said that they were torn between us and GPhi, so I would put them in contention with us.

I would say this is a more accurate list:
Chi O/Tri Delt
Kappa/Pi Phi
Theta/Zeta/G Phi
DG/AChiO
SK/ADPi/AOPi

The above ranking and competition list is pretty accurate. I might switch KKG and DDD, but otherwise it is spot on!

Not sure how SK can compete with AOII for girls when AOII didn't do formal rush last fall?

I think you'll find my experience to be pretty much true. When you look at where girls go to pref, you find the same general ranges.

Chi O/Tri Delta/Kappa
Pi Phi/Theta/Zeta/G Phi
DG/AXO
SK/ADPi
AOII -- we'll have to see

I'm sure some Pi Phis will complain that they're not on the top row. I just see them more in competition with the next row. I know they'll object to having G Phi on the same row, but honestly, those houses are who I see them compete with. As for AOII, we're in a wait and see mode. Right now they seem to be at the bottom but a few good classes could definitely pull them up. They don't have a bad rep, so they could do well.