Hey guys,
I wanted to give you a heads up about another oil cooler option that has recently become available. It's an oil cooler kit created by Nissan Motorsports and can be ordered through any Nissan dealer; the parts advisor might not be aware of the part, but he/she should be able to find it with the part number.
Part Number: 21300-SS370
MSRP: $780
Here is a link to a quick blurb that Edmunds wrote on it with a picture of the components. I don't have any other pics, but I've seen the kit in person and the components are top notch.
2009 Nissan 370Z Touring: Oil Cooler Install and First Service | Long-Term Road Tests Blog on Edmunds' Inside Line
Thanks!