My answer is, you've got quite a bit of work ahead of you...
When playing a druid in 3.5 a few years ago I had used the SRD to build a list of Augmented Summon Nature's Ally monsters. I would suggest copying each of the monsters out of the PRD into a Word processor and then just start copying and modifying. It will take a long time, but you will have your list. Unfortunately, I have not taken the time to do this myself yet, mainly because I have not played a druid in PF... Yet.
|Dave the Barbarian|