Great, another kid mature enough to understand the rules of airsoft; I hope you can get something really good when you're 18!
Best of luck and read up on everything, especially gun reviews. If you ask which gun is better, we'll simply tell you it's all based on personal preference.
G&P M4 Sopmod
G&P Mk18 Mod 0
KSC USP Tactical (System 7)
Tactical Airsoft Combat Operatives