Controller layouts

This is a particular example of a situation where I'm having trouble
coming up with a clean controller layout. Say I have a single view
with some ajax slide downs for things such as the email address, name,
address, etc.. The data lives in 2 different models. CRUD fits
nicely, but I'm working with multiple models/resources. If I put it
all in a single controller that works, but it seems messy and and I
use REST won't I have a bunch of custom REST routing? If I use two
controllers, how do I render to the same view from both of them?

Chris