RSX off the list, i hate 350z interior (no room at all, but to be fair im a big guy 6' 280)
G35s f-ing rule, look 10x better than z, more roomier (not huge amounts but enough to make it pleasent)
I really dont know about the s2k, i have never driven/worked on one (im a tech at a nissan dealership, i do at least 1 z or g a day lol) but i have considered getting one, they are sexy with the right wheels