[Taqwus]

Maybe a cloaking device, if you want to reduce the chance that you'll be attacked, and it's common on your other ships. Likewise, ECM III will make it less of a sitting duck if it IS attacked, and only takes up 10kt.

Definitely solar sail if you've got it. Pretty much standard on all my warships / fleet support ships as soon as I can get one.

Point defense will help if you run into an enemy carrier; if they have good propulsion tech, you won't be able to outrun the enemy fighters -- or, probably, their missiles, either. Depends on what kind of support you're going to give the carrier; will you include repair ships, point-defense ships, missile ships (might work well, actually; have your fighters follow the missiles if doing tactical, so PD kills the (free) missiles), etc?

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-- The thing that goes bump in the night