Board Thread:Fleet's Prepared-ness/@comment-31916925-20170705102721/@comment-30542734-20170705111904

http://kancolle.wikia.com/wiki/Partials/Blueprint_Priority

This is the Blueprint priority list that you can use as a reference for your decision. I would advice on using it on one of the fusou sisters or on chikuma to have another CAV which will be useful.

For scrapping the choice is pretty much done... Scrap ALL trophy DDs, they are useless with no exception (fujinami, isokaze, minazuki, yamakaze). There is also makigumo that you can scrap but since you are leveling her up i can guess you want the sonar.

Other candidates are uzuki and harusame if you are done with their quests.

Tenryuu and Tatsuta can be scrapped too (except if you want to keep them for cheap expeditions) but you better keep them as a last resort if you still don't have enough slots after scrapping all the useless DDs.