Oh my, so it becomes more competitive than I expected. Iver and De Zeven?? both are a great packages that no one can denied. And for Daewoo, I have no idea what are the products they've to offer, any clue miss ?
Anyway, this is just light overview about their products:
> Damen Sigma-11516 Frigate
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So far there's only these concept for the enlarged of sigma design, but given to their modular system applied, so it's quite possible to be easier converted onto 130 meters and around.
> De Zeven Provincien Frigate Variant
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Perhaps it is one of her variant. With the I-mast 500 integrated sensor and systems instead the combos of APAR & Smart-L radar, seems it to be a more affordable in price than the original one.
> Iver Huitfeldt Class Frigate
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Honestly, this is the one that offers the best bang for the buck in its class. Despite its size which not that big, but has offer the capability as big as destroyers. Especially to its radar and sensors which can covers a large area coupled with the ESSM and SM-2 Standard missiles configuration, I think it's enough to make it a highly capable for air-defence role.
But if considered that we are not a member of nato or their closest ally, seems it would be difficult to get such SM-2 missile.