Vlad, as you're used to the noise, I would suggest the non resonated, as you may find the resonated too quiet... Ed has bought the non resonated from us as he had a K1 noise exhaust, and the resonated would have been too quiet...
Flat black works well, have a look at this, not the the RAYS but it gives you an idea of how the colour looks - http://www.350z-uk.com/topic/32711-rota-gtr-wheels-–-350z-fitment-from-cougar-store/
You can see images and videos here of both - http://www.350z-uk.com/topic/63096-cobra-sports-exhaust-from-cougar-store/
The resonated will be easier to live with on a day to day basis, as the non does cause more drone in the cabin, we've heard both whilst fitting and the resonated suits more owners...
£374.00 for a new Scorpion and if opted for the Cobra it's £425.00...
Both can be seen here - http://cougarstore.co.uk/index.php?main_page=index&cPath=1_10
Please do let us know if we can help...