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I got a K+N, haven't rejetted and have absolutely fine performance. Thing takes off like a bat out of hell still ya know. I also have a micron exhaust...
I know that if you by a K & N that it comes pre oiled. You can also get a cleaning and re-oiling kit to clean it. but K & N's are meant to go for 50,000 miles. i think the k&n is 57 or 61 bucks.
Ya the stock air filters are a one time use just like cars. To know if a air filter is good or not clean it out with forced air and raise it up near a light and look at it. If you can see light through it..its good to go still.