Welcome Desu-yo! Are you sure you're only 17? You sound more responsible than many new riders who are much older (I've heard there have even been one or two in this forum) who pick a bike simply because it looks slick in the magazines.
The Ninja 500R is an awesome, awesome bike. I've been riding streetbikes for about 13 years now and have ridden many different brands and models. I currently ride an '02 ZX9R that will break an honest 90-mph in first gear
. I don't need that much engine and I seriously considered trading that beast for a 500R earlier this year. No lie!
My wife started on a 500R and it was such a neat bike. It's fast enough to walk briskly away from any car you'll see at a stoplight today. And when you learn how to ride on a light, well-balanced machine like the 500 you'll almost certainly have better-developed skills than the average rider. My wife rode 20,000 miles on her 500R and after a while she was passing guys on full liter-bikes on the curvy road on Palomar Mountain.
The 500R will make 125mph pretty easily and will smoke every Harley, except for the V-Rod. It's light, it's fast and you can get replacement parts for cheap, because Kawasaki hasn't changed it (other than color) for more than a decade now.
It doesn't have much poser-value, but it's a great bike. The only reasons I ended up not trading my overkill 9R for one this year is because I changed the gearing to get better mileage and knew I'd be losing my butt on trade-in because it's already got 33,000 miles on it. (And I kinda bonded with it on our recent trip to Philadelphia.)
Good luck, whichever bike you end up getting! And tell your parents I said you're smarter than the average rider.
-Calamari Chris in Carlsbad, CA
P.S. And Whistle's spot-on! MSF is the way to go too.