KC9R - playing 1000 points or over? Don't leave home without it. 19AD of plasma at range 8, 14 at 12 and 6 at range 16, 12 centre line phaser-1s and effectively 60 forward shields. Turn 6 means it is as maneuverable as a Federation cruiser and it has 10 damage points more than the Condor.
Novahawk and Royalhawk. For an extra 15 points you get 8 damage more than the Firehawk, 2 extra drone swatting tractor beams and command +1.
Fasthawk - Expensive for a fast cruiser but still turn 4, 8 dice of plasma and 8 phaser-1s on the centreline. Two in 8" of the target can put out a possible 32 damage on a turn where they don't fire plasma torpedoes.
Sparrowhawk vs KR - Sparrowhawk has better damage, better phasers, better shields outside the forward arc, the same plasma dice below 8 but 3 less at 8-12. It is only five points more. The KR has better shields in the forward arc and can put out more plasma at long ranges.
For small ships
Battlehawk, 6 dice of plasma, 4 phaser-1s, able to fire plasmas out to 12", which most ships that size cannot.
Skyhawk - Good for a wolfpack ship as agile and has very good phaser arcs. Expensive for a frigate, but all Romulan ships are paying more for cloak.
The Romulans have some very tough ships with a lot of phasers. With a KC9R flagship, a core of the Novahawk/Royal Hawk Command Cruisers (which are basically battlecruisers and are priced as such), sparrowhawks for cruisers and battlehawks for flankers and Skyhawks or KF5Rs for a wolfpack, they've got a good fleet mix.
It will be very interesting to see what they get in the next supplement. The Skyhawk Leader is a Skyhawk that gains a plasma G, so depending on how it is pointed, might make a very interesting addition to the fleet.
The KFR Battle Frigate is the Romulan version of the F6 Frignaught, which basically puts another engine and a plasma G on the KF5R. Depending on how it's converted and the points it could be a very nice addition to the force.
The Sparrowhawk J replaces the wing phaser-1s on the sparrowhawk with plasma-S torps, giving it 16 plasma dice at range 8 and 9 at range 12. I imagine it won't be able to fire them all at once like the New Jersey Battlecruiser, but it'll be interesting.
The K4R and Seahawk frigate would add some much needed cheap ships to the Romulan fleet list.
No guarantee any of them are going in, but there's plenty of SFB stuff it would be interesting to have access to.