I remember reading years back actually that the plan was always to make the base model, a Spec V and a 3rd stripped out, caged racing version that was named back then as the EVO Spec.
But right now the Spec V seems as useless as the Nismo Club Spec in terms of gains for $$$ value.
Then again - the NUR spec R34's aren't exactly all they are cracked up to be either but people still seem to get a boner over them.