Well,
SM is best played mechanized.
You have two full Tacticals and one Rhino. I'd add a Razorback.
Add the Scouts for your army list.
As
HQ, I suggest a Librarian w/ nullzone, avenger. I attach mine to a Termie squad, so I give him terminator armor and storm shield.
The Dread complements your army so that you can play at the 1000 pt level.