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Slotted and drilled rotors are marketing tools. They are not superior to vented rotors - they may cool somewhat better, but they are not as durable and will not last as long. They also can cause weird scalloped wear on pads and rotors.
Instead of doing that, try the following:
Pull your rotors and have them measured for runout and thickness. If they're within spec, leave them alone.
Replace your stock front brake lines with braided (stainless) steel lines. This will eliminate any give in your old, probably original brake lines.
Flush all of your brake fluid every 2 years as recommended. Dot3/4 Brake fluid is hygroscopic - you can look up the problems with old fluid elsewhere, I want to keep this to the point.
Clean, lube, and replace if rusty the slide-pins (if you have sliding calipers, I'm not sure about the 89 240's. I would think they'd be standard, but my old 84's were not sliding type)
Use ... well, use non-organic pads. I swear by semi-metal pads. Never have tried ceramic or kevlar, but Axxis/PBR Metal Master pads are great, other than that they cause some people a lot of dust.
If you're looking to get better performance from something, you'll get easier and more reliable results by doing a "stage 0" - that is replacing ALL of your old worn components with stock before you go replacing one or two with upgraded components.
A brand new set of rotors in an otherwise unmaintained/worn brake system won't do much of anything. Other than vibration from high/low spots, brake rotors don't have that much effect on braking performance under normal use, even hilly use.
Hope that's a push in the right direction,
Cheers
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