well i really wanted to make a black sun squad so here goes:

Darth Vader, Legacy of the force 71
Xizor 30
Imperial Governor Tarkin 22
Twi'Lek Black Sun Vigo 18
Twi'Lek Black Sun Vigo 18
Czerka Scientist 13
Mas Amedda 8
Admiral Ozzel 11
Ugnaught Demolitionist 3
Ugnaught Demolitionist 3
Ugnaught Demolitionist 3

Preferred Reserves from Xizor:
Twi'Lek Black Sun Vigo 18

Preferred Reserves from Ozzel:
Imperial Dignitary 5
Imperial Dignitary 5
Imperial Dignitary 5
Raxus Prime Trooper 5

This squad is pretty much just like the black sun cannon squads but with one major difference... Xizor. he grants +4 attack and +10 damage to the vigos and gives a chance to get more vigos so in total each of vigos can do 240 per turn at +17 attack...
So... tell me what you think!

You will do better by using only 2 of the Commanders, instead of 4. If you think about pure volume of shots, Ozzel is a waste. You actually want each TBSV to be able to go early, to hit with jolt. With 6 shots per, at +13 for 20, then +17 for 40, why would you not want to try for jolt? So to start, lose him. Then sit down and think about which ones you really want. Either, drop Vader, Xizor or Tarkin, and insert more Vigos in their place.

Since you called it Vader Cannon, I will assume you want to keep Vader. In that case, I suggest dropping Xizor or Tarkin. There are benefits to either, but I would choose Xizer myself. You can get 2 more Vigos out of his points, which if you think about it, pretty much equals his benefit to the two you currently have, without even considering the additional advantage of having more damage dealers. You still get 6 shots, and still have Vader for interference. If you worked it right, you could probably get 3 more Vigos in there, and trust me, you won't need Ozzel when you have that many of those monsters to run around.

I would also suggest considering a BG for the czerka primarily as well. Otherwise, she will be target 1 for your opponent.

Optimally, Vader really isn't necessary for this squad. Sure, you should be using him as a meat shield to keep opponents from trampling on your Vigos, but in most games, I think you'll find that 71 points for Vader's CE is way too much money. Bill's suggestions are great, but also consider what kind of opponent's you tend to face. Does someone local tend to run Droids with Lancers a lot? Vader won't help you at all there. Vader's 71 points would get you 4 TBSVs. Or 3 TBSVs and some bodyguard help, etc. I would definitely agree with Bill that you don't need Ozzel here. He's more hurt than help in this sort of squad. I would spend those points on things like protection from Lancers or Yobuck instead.

i would go one of the thrawns,TBSVx4,xizor,Mas,Czerka, and filler

I know this is a 200-point squad, but I thought I'd bring out my 150-point variant:

30 Xizor
22 Imperial Governor Tarkin
36 Twi'lek Black Sun Vigo x2
13 Czerka Scientist
11 Admiral Ozzel
8 Mas Amedda
21 Aqualish Assassin x3
9 Ugnaught Demolitionist x3

Preferred Reserves:
(Admiral Ozzel) 13 Shadow Stormtrooper
(Admiral Ozzel) 5 Imperial Dignitary
(Xizor) 20 Bith Black Sun Vigo

(150pts. 13 activations)

I'm not sure about the reserves though, since it's a 5% chance of hitting the reserve number, and I never seem to be able to hit that number.

As much as everyone loves their vigos they can still fall. Unable to benifit from anything besides allies or commander effected commander effects they can be hurt.

I would have 4 vigos top, maybe more around three and some support like Jarael that could synergize with them.