Your car is older than you are...before you start modifying your car make sure the parts that are already on are up to par.
I'd be willing to bet that
at a minimum you'll need to replace the following...
Ball Joints
Control Arm Bushings
Steering Rack Bushings
TC Rod bushings (in this case you're actually better of by replacing the whole TC Rod - check out
Battle Version for some nice stuff. And if you have a mishap they're the only company I know of that will you sell you a single TC Rod.
Actually you should just replace all your bushings (I like Whiteline but Energy Suspension has a nice kit). After that I'd certainly look into a decent limited slip diffand a decent seat that will hold you in place.