WHICH BIKE?!?!

Where do you live? (country not street address please) Because those first two I've never heard of. Are you into athletics now? The reason I ask is because lots of people buy bikes with great intentions of riding them, and they do for about a month or three, then the bike ends up in the garage where it becomes garage art for the next 30 years!! It takes a lot of dedication to start cycling, running, belonging to a gym, etc to keep it up...most don't have that dedication. If you're not sure why then not buy a slightly less expensive bike, say around the $400 dollar range, then if in 2 to 3 years from now you're still had it and have out grown the bike then you could move into a nicer one then even the ones you're looking at.

And as I just hinted at due to the fact you are only 15 you could still grow another inch or more, thus within 2 to 3 years you may be too big for a bike you buy today.

Also you need to learn to fix flats on your own, so if you have a parent that knows how or a friend have them teach you so you don't end up walking a long distance home some day.

Also consider boy friends, are you willing to keep up the sport in spite of having a boy friend that will consume a lot of your free time? Back in the Stone Age I bought an expensive bike when I was 16, but I was into running so getting the bike was natural. I had the bike for a year and rode it a lot. But one day I came to the realization that girls couldn't figure out why my bike cost more then my car!! So I sold both and bought a nice car.

There should be some nice examples of last years bikes at your LBS's in town that would cost between $400 to $500 range reduced by a $100 or so just to get them off the floor.

But if you're steadfast on one of those 3 bikes, I kind of liked the first and second one because they looked graceful. I would suggest that you ride each of the 3 bikes for about 5 miles or so, not just around the parking lot, to see how they feel to you, then buy the one you like. Also get a bike being a tad larger rather then a tad smaller so you will have some room to adjust the bike and grow into it as you get older. Again make these thoughts known to the salesperson so they can find the right bike.

Leave enough money in your purse to buy extras like a helmet (very important), water bottle cage and bottle, flat repair tools like a pump, tire irons, and patches and shoes because the bikes you're looking at require special cycling shoes. There are other extras like a computer, lights, clothing, but you can do that stuff as needed.