I have had good success with the following list:
Vader - Force Reflex, Sabre Throw
Storm Troopers - extra trooper - DLT-19 - concussion grenades
Storm Troopers - extra trooper - DLT-19 - concussion grenades
Storm Troopers - extra trooper - HH-12
Storm Troopers - extra trooper - HH-12
Storm Troopers - Impact Grenades
Z74-Z Speeder Bikes
Z74-Z Speeder Bikes
This is exactly 800pts.
Vader is best with mass troops as he essentially makes them fearless if they keep in range of him.
The 2 HH-12 units are enough to drop a T-47 or ATRT in a round with minimal backup required.
The impact grenade unit are my infiltrators. They run up to a vehicle and give it love. Also a good distraction unit.
In general I like to have a heavy weapon in each squad as it allows for split fire and more suppression on enemy troops.
I put concussion grenades on the DLT-19 units as they can move and fire and when they get to range one, the troopers can exchange their crappy white dice for black dice. Always keep these guys moving.
The HH-12 should find a good piece of cover and stay there so they can reload and shoot each turn.
The bikes could benefit from long range comm links but so far I have been able to get good use out of them within Vader's command range.
You will notice there is no ATST. This is intentional as I do not believe it is best to run with Vader.
When Veers is released I will run 1-2 ATST with him and 2x HH-12 units for the three actions (reload, Aim and shoot) and snow troopers for filler.