[Strategia_In_Ultima]

Shipsets would be best. Some shipsets have a highly detailed background story, but some are merely, well, shipsets, sometimes not carrying any background at all. Sometimes multiple shipsets of the same race exist (Eysk, Imperial Union). I think that, in light of these conditions, Shipsets would be a better term, as that term is also used more often on this forum I believe.

Multiple Wiki articles can have the same header, but you'd have to make sure that they have different URLs (for want of a better term), for instance you can have three entries for "Warp Point", but you'll have to make sure that you keep "Warp_Point_SEIV", "Warp_Point_SEV" and "Warp_Point_Starfury" as separate pages.