What a nice position to be in
It's personal preference with the RB vs SR part, I personally like the 6 cyls so it would be out of the two skylines.... In saying that, S15's are sweeeeet!
Now you have to weigh up - age, high km and awesomeness of being a GTR vs low km, newer (and better looking ) but not a GTR...
So i guess if he wants a daily go the GTT, if he wants a weekender go the GTR!