Have you read the guide in my sig? Its alot of information, but its all good. Let me break it down for you really quick. Your front end is a modified machpherson strut. A macpherson strut is a coil over type spring and shock minus the height adjustability. So on our cars, The shock goes directly to the spindle and gives you good dampering. The spring however, is half way between the wheel and the frame, making for poor wheel rates and a generally shitty ride. Coil overs fix it, but its more expensive. However, when you weigh out the costs of a PROPER lowering job, its like $400 more and there is nothing better than coil overs for every type of driving. don't argue with me there anyone, cause your wrong. Coil overs are lighter, have height adjustment and you can get them as soft as you want.
The rear suspension is its own story. Similar concept with the struts. Spring 50% of the way from wheel to frame and shock directly on axle. However, the big difference on your rear is, you have a 4 link. 4 links, are trash in every way. your axle winds up and swings side to side under cornering. Since you are only really worried about the straight stuff, I wouls simply recommend new LC's. new UC's is stupid because the only difference is the bushings, and you can change those out if you REALLY want to. Other wise, the new LC's will take care of 80% of the axle wind up, and lead to much better hooking. Plus adjustable ones will give you some minor height adjustment. Which will let you fine tune your rear traction.
You don't want coil overs in the rear because, they are expensive, and will really stiffen up your ride, most likely to a point beyond where you want it. Fron't coil overs can actually improve ride quality and handling, rear coil over won't. They just don't make soft enough springs for that to happen... Sorry. However, a good set of shocks and a nice set of springs with the help of some LC's will have you launching great. Not as well as it could mind you, but untill you invest in some boost or a serious shot of laughing gas, traction won't be an issue yet. you break the 400 rwhp mark, and I'll tell you what your next upgrade should be.
All of this info is in my guide BTW. Look for the posts with LARGE lettering to see what is important.