Hi Adam,
All of our phones in the office are Cisco (79XX), about 20 of them, including expansion modules.
We decided to use SCCP a long time ago, and tested SAIL with them and they worked perfectly, but the configurations were all done by hand.
Nowadays we no longer use SAIL, and we still use the SCCP with a FreePBX interface.
I think the 793X models should work just fine, if they follow the same provisioning model as the phones.
Best,