I'm about to pull the trigger in a new Phantom 2 non-vision (I have a GoPro Hero 3+ Black already) Eventually I want to built my own as I'm an engineer, but I want to get used to the systems, the lingo, and the different components, sensors available before I develop my own. I looked at Amazon and they sell the P2 for $829. I also noticed there's a warning for a "new version" and the new version is the V2.0 So to make this posting short I have three questions only: 1) Any place better than amazon to buy the P2 (price wise)? maybe waiting to Black Friday? 2) Would anyone recommend buying a used one? any advantages other than price and maybe getting extras? Any risks? 3) If I buy the basic package, what else you'd recommend as a must have? second battery pack? IOSD? any other? Thank you for your help.