I have bought a X450 frame:

(http://www.goodluckbuy.com/index.php?target=products&product_id=78864) and an APM 2 controller 

and I am a little stumped as to what to choose in regards to power system for my quad.

I am looking to get as long a flight time as possible (goes without saying really) and carry a GoPro and some FPV kit.

What would you guys go for?

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