I think we got ample opportunities for iron and horses with this terrain, with less luxes and so on I would go for Iron and horses. But I think we should strike for the Philosophy Gambit and end in Map Making and plan long term for Republic this Term.
Then, following Map Making, we should trade for as many strategic resource techs as possible, or research them cheap. But we badly need the Lighthouse, as we are stuck in the far southern corner of the Map. Transport speed will be essential this game.