Wheel advice

Lowing ride height compromises ride comfort.
Widening wheels compromises wheel fitment.
 
If you don't want to roll your guards, then just stick to relatively stock sizing or maybe go very conservative 7.5" 8.5" widths. If you want to keep your ride comfort, don't lower with king springs.

Lower/stiffer springs doesn't necessarily improve handling. If the springs you put in throw the balance of your car out, you will be worse off, even if they are lower/stiffer than stock.
 
I would personally go with Eibach springs over king springs. They have a street spring kit which will lower your car a little and also reduce body roll, without sacrificing too much on comfort.
 
If you're not concerned with "stance" or the diameter/flushness of wheels, perhaps go something along the lines of 17x7.5 +30-35 and 17x8.5 +30-35 to minimise work required to have them fit.

lol!  "Hella-whatever" love it :D  good call
 

"So if I swap the springs and they throw the balance of the car out, can I fix that with adjustable shock inserts?"
That's the wrong way to think about it.  Fit the right spring set in the first place or keep the ones you have now.
 
Re lowering:
How much do you want to lower it and how much do you have to spend?   
For example if you go one inch lower than the stock SW20 '92+ model ride height the stock shocks won't cope, so you'd also need to fit expensive heavy duty shocks like Koni or Bilstein.