Actually, this reflects the idea of modern naval warfare better. Naval warfare is more similar to Sins than air combat, as it is all about ships moving in a confined space without worrying too much about the third dimension.
The navies usually have the following hierarchy:
lesser craft (e.g. scout ships, torpedo boats)
destroyers (the ones who give the battleships in the rear an idea where the enemy might be and to hold ground for a few minutes until reinforcements arrive. They also have decent anti-fighter abilities and a very nasty sonar/radar system).
light cruisers (They focus on engaging the lesser craft and destroyers from a longer range. They put up some cover against strikecraft as well).
battlecruisers (these are not cap ships. Of course they can deal heavy damage to any of the lower vessels, but will definetively lose against the hardier guys. Like the destroyers they have a very strong radar/sonar and can dish out insane amounts of damage against all kinds of submarines)
Heavy cruisers (What is now Kodiak and Enforcer. Massed they are the bane of all capital ships because they exceed their firepower easily when the combat ratio is 1:3 or higher. Of course they are easier to produce than cap ships. But sorry, they cannot defend well against strikecraft and can easily be destroyed with two or three torpedoes as they are rather slow.
Capital ships (aka Hood or Tirpitz or Iowa). These are the backbones of a navy. If everything else falls, they fall quickly as well. But, their long range and massive amount of damage to both air and surface vessels is insane. They also can take a few more torpedoes from a submarine because of their huge armor and good repair teams.
special ships (esp. submarines. well, think of having phantom ships in your fleet. But this should be something for a 4th or 5th expansion. Also: fuel and ammunition transporters or heavy freighters carrying special goods for a consigned mission from the AI *huh*)
So, if you think about a new class of ships for sins, they should be put in the field of battle cruisers and heavy cruisers. Mind you, the Kodiak and similar should be put in the new class as well or it wouldn't make any sense at all. There should, however, be a better light cruiser then.
On the other hand it would be very necessary to increase the AP/HP/SP of the capital ships, including a slight revamp of their abilites, mostly by giving them passive aura bonuses (better than to give them more abilities).
So, now that I have come with a bit of background info. What do you think might be good ships for the new class (ranging from battlecruisers to heavy cruisers)?