Welcome to the forum fellow local
I help out with basic maintenance and mod installs for a number of other local Z owners. If you ever need anything, don't hesitate to contact me.
DO NOT get the miSHITmoto oil cooler. It's Chinese garbage, and they will not warranty your blown engine when the O-ring fails and your oil dumps out all over the street.
Fast Intentions seems to have the best quality product, but Z1 and Stillen make perfectly capable oil coolers as well.
I recommend an exhaust and a tune to go with your intakes. Those three items are the best bang for your buck combo. Add some test pipes and you've basically maxed out your N/A power without heading down the rabbit hole and spending ridiculous money for very little power in return.