I am not new to the RC hobby but i am new to RC planes. The planes i have been looking into are the Aerobird Challenger and the Aerobird Extreme... Any other planes that i should choose from... I was wondering which would be better to start off with? I want something thats good for beginners and something that wont get boring when i get more advanced.. I like the fact that the Aerobirds have to modes to fly in. Sport mode and Pro mode. I was also wondering how big of a field is needed to fly these things?