a long time ago, and many times since, my dad would say that if he were changing parts on a car, he'd buy the best he could so it wouldn't be a weak point later.i've tried to practice the same route, but believe-you-me, that $h!t's expensive!..as i'm sure we all know.
i sometimes buy things just to replace old ones; not really aiming to gain performance, but just to assure myself that i won't have any issues down the road. if my wallet wasn't complaining so much, i'd change just about everything. but for the time-being, if it ain't broken, i won't fix it. lol
other than oem for oem, i haven't changed (on any of my cars except the hachi) a whole hell of a lot on the suspension side of things. here's a link to FRSports. i like ordering from them because they're really quick and work hard to make sure i get my damn mail!
http://www.frsport.com/Suspens....html
unless you're having an actual problem with your steering rack, there's probably no point in replacing it. you usually buy a rebuilt oem one anyway. if you're going to start piecing things together, then you've got a good start, and i like the sway bars too.
new bushings are the hizzy. they're easy on the wallet, a pita to replace, but another good place to start. after that, i think everything else is just gravy. myself, i wanted to instal a nismo power brace, pillow ball tension rods, inner/outer tie rods, and probably hang out with that for a while. i don't think you really have to make additional changes or upgrades when you install any single component, but i'm sure a lot of these components are good "compliments" to other components.
my #1 favorite thing to make my handling a million times better?!?:
some damn good tires
yokohama's AO48s are my, by far, balls-to-the-wall, favorite tires. i ran them on my hachi.