You may have to get caster/camber plates for 1.5" drop too. You won't know for sure if you need them until you lower the car and take it in for an alignment.
Caster/Camber plates attach at the top of the struts and allow for more camber adjustment which is the amount the tires lean in at the top. This is a standard adjustment on all cars, the c/c plates just give you more adjustment which is needed when you lower your car.
They also provide caster adjustment which is not possible to adjust on the stock setup. Caster is the front to back angle of the struts. You know how a chopper (bike with long forks on the front) handles? The forks are angled way out and it feels like the handlebars want to stay in the center position when you try to turn. That is caster angle.
You don't really need adjustables, but I'd save the extra moiney for them personally. I went with Koni's because I have heard nothing but good things about them and they are guaranteed for life (even on a lowered vehicle). BTW, I couldn't be happier with my decision to get Koni stuff.
I've heard KYB adjustables are good enough for a lowered vehicle, so you'll probably be ok with them and save a little cash. The higher end stuff would be Koni's, Bilsteins, or Tokico's. All very nice stuff.
You will have to have an alignment after installing springs. That's why I recommended doing it all at once, plus it'll save you a lot of repetative work.
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[This message has been edited by 2FastLX (edited 04-06-2001).]