On those bikes (and being a newbie) you're really not going to NEED or even notice a difference with the steering damper, nor do you need the stainless brake lines.
Exhaust? Yeah, you'll get a small horsepower gain (which again, a newbie on the streets probably won't really notice), but ESPECIALLY on the ZZR, it'll make a huge difference in appearance (HUGE), as well as sound.
If you can find one, get a cowl for the rear seat (this, too, will clean up the overall look of the bike a LOT), get some good flushmount turn signals, and if you're buying new, get ride of the "whale tail" and get an aftermarket tag bracket and turn signals.
And depending on the color of the bike, a dark smoke/tinted windscreen helps the looks of many bikes.
Good luck, and enjoy!