My personal preferences are: SZ & Ashspecz, mainly due to having worked with them on multiple occasions. Z1 is not on my Fave 5's with ecu tuning.I haven't worked with harry (Ztuner) but most love his work and customer support. Nistune is a different ball of wax for someone that hasn't tuned before... I would say start out with a major vendor of your choice, and if you choose to dive into Nistune or other tuning gear, you can learn it over time while still having a solid ecu to work with in the mean time and enjoy your Z.
~Mario D. Quotes:
“Never stop believing..Magic is just science we don’t understand..Every original idea was considered insanity at first..” This is a quote from Heavy D’s Twitter account a few days before he passed. RIP: Dwight Arrington Myers (May 24, 1967 – November 8, 2011), better known as Heavy D. My Siggy: 
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