I gotta go with the Tigara here. sure they aren't as big and powerful as a Sharlin or Shargoti, but that can be deceptive, do not underestimate this little powerhouse. With 6 molcular disruptors and 10 fusion cannons this ship packs a punch, add to that a flight of 6 Nials and 2 flyers and you can give an Omega a very hard time. And let us not forget my favorite weapon...those two antimatter converters (with a range of 5), if you are up against most heavy ships, like an Omega that you are doing alot of damage with each shot. Using an Omega as an example target it would do 58 points of damage per cannon (ignoring target DR), against a Narn T'Loth it would do 46 points each, and against a Shadow Ship it would do 80 points per cannon (a group of 5 Tigara attack cruisers at close range could destroy a Shadow Cruiser in a single turn).