The stock 80 series spark plug is a cooper core plug. It is designed to only last about 30k miles. Then it will not work too good. If you have the right parts guy then you could get a iridium plug (cross match) to go the miles you suggest Brian. Toyota never had a platinium for the 1FZ here in the US. As for the Cap and Rotor, I would never run these past 45k miles. But for the price they are not unreasonable to change out. As for the wires, many of the aftermarket wires are silicone material and I have seen too many brake down and start arcing to ground in only two or three years. My experence with stock is they will last a good 10 years and well over 100k miles. I have not seen that many after market wires do the same. Besides most aftermarket fit poorly, not the right length, nor come with the dielectric grease on the spark plug end. But hey each to his own. If you get with the right parts guy then the prices are not that much more expensive then some of the aftermarket crap that is out there.
later Robbie
later Robbie