JustHey,
It sounds like you are having an extremely successful Rush! I know that you're torn about AOPi since you live on the same floor, but I'm really proud and happy to hear that you're being objective and keeping an open mind.
If the girls told you that they will still be your friends if you go somewhere else, then believe them and follow your heart.
When I was in school, I had several sisters who had some of their best friends in other organizations, and lived with them for years. One in particular had 2 ADPi roommates and a Phi Mu roommate all at once!
So, don't worry about what your AOPi friends will think when you sit down with those bid cards. If they are truly your friends then they will continue to be, regardless of where you end up on Bid Day.
Anyone who is a member of a GLO understands that pledging a sorority is a personal decision, and isn't one that should be influenced by others. From what you've told us, I really think that your AOPi girls will respect whatever choice you make. The hard part will be narrowing down your choices, because it sounds like you've got some great houses on your campus!
Reminds me of that song that goes... "It's your thing, do what you wanna do..."
Good luck!