I have to admit, other than the R33 and maybe the R34, one of my favourite Skyline would be the 2000 GT-R. It's a car that dominated the Japan race scene in late 60s to the early 70s. Nickname: 'HAKOSUKA'.
Below are pictorial reference gallery to Hiroboy, one of the well-known car modeller in car modelling scene.
Hiroboy's Skyline 2000 GT-R Gallery