Check the invoice pricing thread
http://www.the370z.com/nissan-370z-p...ice-price.html
imho, anything between MSRP and invoice is decent, but closer to invoice is great.
Personally I don't like leather (just stick to it in AZ heat) and the cloth seats are very, very nice. The suede door inserts are kinda cool, but not worth the extra $2k to me. You can install lighted kickplates later on either trim (I am!) but not sure if there's any difference other than that. Depends on how much you like leather I suppose.
*edit - fixed link