2006 Kia Optima LX, 2006 Kia Sportage or 2005 Nissan Altima?

[Jay]

I found a Kia Optima 2006 with around 41,000 miles in mint condition. It is around 7900 dollars. I found a 2005 Nissan Altima with almost 100,000 miles ( is that too many?) with a few scratches and dents at around 7000, and I found a 2006 Kia Sportage with around 50,000 miles with a couple things broken( air vents and such), but pretty free of scratches and dents around 9000. Which one would you recommend I buy/ look into a lot more closely?

I am 17 btw so safety is a big consideration.