heavy cruisers (for all 3 factions) are one of two ships up to the task of anchoring fleet. the other ship type of course is the LRM frigate. cruisers are MUCH more durable and are particularly adept at destroying LRM frigates (though they deal good damage to just about everything really). if you have an end game economy and can support heavies they're probably a better bet to anchor your fleet than any other ship.
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I would like to second this. It's not just for Vasari, but for all races. Your first job should be to tech to the long range frigate, and your second job should be to tech to heavy cruiser. These two ships, one for early game, one for mid-game, will be the vanguard of your fleet. Your anchor as transitive puts it.
To me this means they will be 50% of your fleet, with other ships making up the rest to support them by making them either more powerful, or shoring up their weaknesses. Once you get heavy cruisers out, also realize that the long range frigate now becomes a support ship for taking out light frigates and adding damage against cap ships.