It all depends how far you want to take it an how much you want to spend...... First, why do you want coilovers? You can get plenty stiff torsion bars so unless you need big spring rates, it may be best to stay with the torsion bars. Adjustablilty, Something like a factory spring plate, WEVO one, or a Sway away one all have adjustment in them.
Now back to your question. You need new struts (rsr style) that should come with all the required bits an pieces. Try
www.theracersgroup.com or
www.smartracingproducts.com for prices. In the rear you will need new shocks (rsr style) and they should also come with all the bits and pieces, see above links. Take it a little farther and really open your wallet and spring for ERP 935 style front a arms and crossmember and 935 style rear spring plates.
Put all of this stuff in and you have a very adjustable suspension. Ride height is a snap by using the threaded perches on the shocks and struts. Toe adjusted seperately from camber on the rear. Up front you can change track, castor, camber with the adjustable a-arms. You can also still adjust castor and camber at the strut top as well.
I have custom valved bilstien struts/shocks with SRP hardware and got the 935 style front and rear stuff from TRG. I am very happy with all of it. It is lighter weight than the factory stuff as well.
All that said, it is a big bunch of change for upgrades that may or may not be better than staying with torsion bars.
Hope this helps a little.
Cheers