OK, I'll post there. I thought most folks over there are using the vellman board which is not bad but has very limited expandability.
Two other possibilities might be:
1- To use an ELK panel simply as an Insteon translator triggering Insteon actions from either contact closure or serial input from Stargate. Problem is the Insteon setup on the M1 is kind of restrictive from what I understand. I know Dave Howard made a utility to help with setup but I don't really know what it does.
2- Find out if there is a way to control Insteon from a netiom board. I could then use xPL messages to to trigger lights from Stargate and connect motion sensors directly to the netiom if I want.