The G keys are mounted on their own rod between a set of posts offset from the rest of the keywork. It allows for players with small hands to more easily reach the G key with the left hand ring finger. In-line G combines the keywork with the A and Bb keys so that all the keys are in line. Plateau model flutes have closed holes. There are arguments pro and con for both types.
Most people opt for open hole flutes above the student line instruments.
You've played the flutes. You've made tough decisions regarding available options to customize your flute. The price is within your budget. It feels great in your hands. That trusted set of ears that came along for the ride with you says you sound dynamite.