On the poll.
I'd go for a reguler Omega over the Pulse variant, as has been said it is a sniper platform, and it does not suffer from its main weapons being interceptable.
From your fleet, you have useful initiative sinks in the Poseidon; it'll haunt the back of the table spewing Starfuries/Thunderbolts and providing a +3 Initiatice bonus, and your three Brawlers. The Omega's should generally be the last things you move to allow you the oppertunity to make the most of the available (i.e ships that have not moved) targets.
If your feeling particularly brave and nasty, squadron the Omega's up. 8 AD of Super AP, Double Damage Beams will put a crimp in anyones day.