Hey, welcome to the forum!
I'm a fellow 1.5 N16 owner, also bought as my first car when I passed my test last year. I've gone down the route of mostly sticking to small cosmetic mods like adding a spoiler and a set of alloys, as well as recently lowering the car on up-rated factory dampers. It handles so much better with the dodgy standard suspension changed, and is much more fun in the corners.
All I would say is be careful spending big wads of cash on your first car. Obviously it depends on your finances, as well as how long you intend to keep the car and what you plan to do when it comes to eventually replacing it. As Ed said, if you do end up getting another N16 and all the major parts are easily transferred, then great. But i know i wouldn't want to splash hundreds on mods for a car that's going to be changed a year down the line.
Just think it through. Can't over emphasize the transformation in handling you get with better suspension setup though, definitely a good way to go!