Just a bit over your price (get a coupon from this forum), but try the excellent Nikon M-223 3-12x42 side focus
with the BDC. I have lots of rounds through one and the BDC makes things simple from a trajectory point of view. From the choices you were looking at, it seems like it may fit the bill. Go to the amazing Nikon
Spot on Technology website to download ballistic information that you can even print out and tape to your scope or gun. Great light transmission, tracks great, and has a superb reticle in a rugged product that will take all the abuse you can give it. With plenty of exit pupil at low magnification and at 12, lots of power for the long shots. Nice gift for your boy, enjoy!