Have to agree with Burger...
Sunhawks, under second edition you want really large numbers of these as the variants of these are the core of the fleet.
Warbird (and variant) and Strikehawk are good as well, but you will only really need about 3 to 5 of these for most games now. They used to so much better than the other ships you needed a pile of them.
Firehawks are actually very nice, I would want a couple.
Stormfalcon, Nighfalcon are attractive enough models, but rarely pay for themselves. A squadron of skirmish ships are much better, and activates just as welll, plus splits up late in the game to help keep bore sights lined up.
Fireraptor I really wanted to like, but frankly its a waste of space in the game. The example of Mongoose using the Drazi as a joke race, here for comic relief rather than as a serious option, despite being the largest empire inside the league.
Ripple