I loved the way my 260z felt with tokico illuminas and tokico springs. I had small sticky tires (205/50/15) so it also sat pretty low, which probably made a big difference as well. It was very aggressive and very streetable in the roads of downtown Los Angeles.
If its will see the track occasionally, I would go springs/struts. If I was more dedicated to the track, as in an extra set of track wheels with slicks or something, I would get the coilovers.