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The K&N is an interesting thing. It allows more air in when it's new, but doesn't filter as well. When it gets dirty, it restricts air a bit, but filters much better. I don't mind them tremendously as a cost-saving measure over the lifetime of a car, but they definitely aren't as good as a WIX paper filter.
Oh, and if you use the K&N, you will have to periodically (once a year or so) clean off your Mass Air Flow Sensor (MAF or MAS depending on who you talk to) with special cleaner - not carb cleaner or alcohol - that you can pick up at an auto parts store.
The electrodes in the sensor get oil on them from the fresh K&N, then they gradually accumulate dirt on them as it gets through the filter and sticks. Since they're heated resistors that are supposed to react to real-time temperature change to read how fast air is moving into your engine, they need to be CLEAN.
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