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Ah yes, reluctor ring... That's the term I was looking for.
The LM1815 looks nice, though a tad pricey at $4 a piece +shipping. On the other hand, application-specific circuits tend to be less buggy and longer lived than something cobbled together, especially in automotive applications. I would also be worried about the electrical characteristics of a custom-made circuit. If it doesn't have enough input impedance, it could drag down the sensor signal and interfere with whatever else is using it. That shouldn't be a problem with an op-amp, but be careful with any kind of signal conditioning you might use to protect the amp's input.
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