How about 6S 4400mAh with 2 of this:
http://www.amainhobbies.com/product_...ducts_id/24726
Or just get one and you'll be good for 6 minutes.
Edit: I hope Mike doesn't get angry at me, but here are some other options. 2 of these
http://www.readyheli.com/Kong_Power_.../kp-3225-3.htm would work good too and only 600 grams.