I asked a similar question before... apparently you get about 45-60k miles off shocks and should replace them while your in there.
With the sportline drop you will probably need camber plates, everyone likes maximum motorsports 4 bolt.
Everyone seemed to recommend kyb adjustable shocks
Note: lots of people complain of rear spring sag on sportline (the 2" drop). I'm going to get the pro kit as nobody complains about it and you probably won't need camber plates (another $150-200)
You should get H&R supersport springs. They drop almost 2 inches & u dont have to worry about sagging. U could say they are in between the pro kit & sportlines, & the ride quality is still decent, as long as you get some good struts/shocks. As far as struts/shocks, Bilstiens are my favorite, along with Maximum Motorsports caster/camber plates.