The turnigy plush esc's are fine buddy.
Remember, with a camera onboard you won't be flying the same way as without - it's all about smooth rather than aggressive so current draw is substantially reduced. I know of loads of people with 18amp plush on 450's with no problems.
I'm not up on motors, but of those listed I'd go for the sunnysky ones from banggood (I'm interested in those myself so you can be my guinea pig...)
My 450 is currently unbalanced in both prop and motors (ie I've not balanced them) and fly's fine - might be down to abit of flex in the arms though
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