Don't worry about getting all the C-Store ships between Lieutenant and Rear Admiral... getting to max level is relatively fast in this game, and low-level ships are next to useless at high levels.
If DPS is all you want out of a ship, you won't go wrong with an Escort-based build, since Dual Heavy Cannons are highly-efficient damage-dealing monsters. There are trick builds that use other abilities and weapons to match or beat DHCs in damage output, but DHCs on a Tac/Escort are nearly foolproof as a source of high DPS.
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If DPS is all you want out of a ship, you won't go wrong with an Escort-based build, since Dual Heavy Cannons are highly-efficient damage-dealing monsters. There are trick builds that use other abilities and weapons to match or beat DHCs in damage output, but DHCs on a Tac/Escort are nearly foolproof as a source of high DPS.
As for a base build, do you have one that I can look at?