I am in Spain\Portugal for 2 months every year & have my D700 and D3S along with a 70-300 VR (mostly for football) a Nikon 28-105 AF, Nikon 35 f2.0 AI & a Rokinon 14mm. I have spent a lot of time in Seville (my fav place), Ronda and Granada. That 14mm is always on one of my cams & when sorting through my (non-football) photos, probably is used for the majority. I don't know anything re: any of the other Nikon systems but if you want to capture some of the beautiful scenery while in Spain, something like the 14mm is perfect.
Enjoy the trip (and tapas)