What are you planning to use your quad for? I really suggest you get 900kv-1000kv motors, as they handle a little bigger props than 1200 will.
Bigger props means more lift, and more efficiency.
You could handle a bigger battery for more flight time.
Play around using this calculator tool to get a better idea of what Props you need for what weight you are carrying, I'd suggest at least 10'' props, and maybe a different frames, even a hombuilt wood frame would be better, as you could quickly repair it, and it would be more rugged. It also would not offer enough clearance for a gopro. Check
these pictures to get some ideas. Also look at how my aluminium quadcopter did in a crash, you will get an idea of how flimsy that frame is.
For your ESC you chose a brushed ESC, these are brushless motors, 30 AMPS is a good choice, so
here is a good replacement.
You need a power distribution cable or board, make sure it has the correct end to fit your battery, I suggest something with an XT60 connector (yellow blocky ones).
Take a look at
my build log, I mention things i wish I had done differently.