I agree the Magnum, Batman, and Kumba all are responsible for bringing forth the modern era of steel coasters, but let's not forget about Raven. This was CCI's first BIG-time contribution to the coaster world, and with it, they changed the way people think about wooden coasters. Before Raven, wooden coasters were caught up in the "tallest, fastest" game: we had Hercules, Texas Giant, Mean Streak, Rattler...etc. With Raven, CCI proved that an 85 foot tall coaster can blow the socks off a giant, and it thus started the pattern of wooden coaster building that we are seeing now. With exception of SOB, almost all woodies built in the last half of the 90's are about 80 - 120 feet tall, and excellent rides at that.
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Coasters...the best natural buzz available.