didnt get where zebronics in 4.7K came in the discussion
about t600-u37, well I do not think that everything can be 100% accurate, but it surely gives regular 600W, can give power upto 700W well the corsair ones are also considered to do similar job, just that corsair does not advertises it like that.
And if Antec-EA 650 has continous power of 650W then it canhandle to give more than 700W also.
So none of these are any bad choice for hardcore OCing or any such.
I do not think VX550 max power would be more than 650W or so. So, a final logical thought would be money and VX550 is little more costly for the requirement. but it certainly gives allout more than 550W continous.
But then if you are spending as much as 5.5K odd why not go for modular PSU. like tagan BZ600