I am thinking of doing the same, going with Seb with an eTune.
Here in Adelaide we have next to no tuners who have worked on a Nissan 370Z and definitely 0 who have done FI on a 370Z . Closest one to me would be Melbourne, which is 450 miles away. But they have tuned plenty of boosted Zs over there albeit only with UpRev
AFAIK.