I'm in the exact same boat. I don't want to shell out $3,500 (family of 4) for signature passes and then feel like we need to pay $40 each day to use the Maxpass, especially when photopass is already a perk of the inflated AP prices. Now we're down to the wire though, so if we want the 13 month promotion we're going to have to do it in the next 24 hours!
We didn't do the AP's. Even with the rumored (now true) price increases, there were too many unknown variables. We would have done the deluxe for a family of 6 = $3600. We wouldn't start using the AP's until October though. I decided I'd rather keep the $3600 for now and deal with whatever price increases come between now and October. I didn't want to end up with AP that we couldn't afford to use because of all the other costs.