The 350 would be a much better daily if you have to lug stuff around. The S2K trunk is SMALL. The 370s are nice but I am skeptical after reading what C&D said about it at their Lightning Lap

http://www.caranddriver.com/features..._3a12.0_page_8

So I would say if you want a little more speed and better daily ability: 350z
If you can sacrifice but want more fun go with the s2k