Adam, if it's new you're after we can help - http://cougarstore.co.uk/index.php?main_page=product_info&products_id=30&zenid=4fc4bd545469d34e3fbb3a72bef15953
Our vote goes to Eibach, we fitted them again to a members Zed yesterday too with adjustable drop links - http://www.350z-uk.com/topic/19628-eibach-anti-roll-bar-kit-from-cougar-store-350z/ - You can also see them on our website too...
Thank you, both...
We do the 20/25 combo here, please do let us know if we can help - http://cougarstore.co.uk/index.php?main_page=product_info&products_id=30&zenid=cc25285859aceff5a06a7463288110a4
Eibach are tried and tested, we've been supplying and fitting the Eibach ARBs on the 350z for the last 6 years and they're always very well received, an excellent handling mod, they also come with new bushes front and rear too...