Welcome.
iirc, sports comes with big breaks, 19's and a sports appearance package (spoiler/air dam)
I personally wouldn't go with the navigation system because it integrates everything into that one unit and you'll have difficulty if you ever want to go with an aftermarket stereo.
Hard to say about the price, but again if it were me I wouldn't want one older than 2012. They fixed a few bugs that year and also added a factory oil cooler, which if you had an after-market one wouldn't matter and would work better anyway. I'm not sure about the price. Mine was <3 years old with 18,000 miles on it when I bought it and I paid 22k.
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“Happiness is having a large, loving, caring, close-knit family in another city.”-George Burns
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