I prefer NGK plugs as i have never had a problem with one in over 25 years. Find the stock one for your car & either use that, or perhaps one stage colder if you are prone to high speed or high load running.
If you have bad colour on these plugs in a 5,000 mile engine, then you got carb calibration problems.

As for the plug leads, any of the reputable brand name aftermarket leads should do the trick.

For really high performance use, try the NGK Platinum plugs. They were about $10 each about 12 years ago, or the Gold Paladium ones are almost as good, but a bit cheaper. You can add up to .010" to your plug gap with these.
I used the Gold Paladium ones in my GX engine & loved them.
Chris