Ok, say I ended up getting a CSM750, not the CX750.
It's an improved semi-modular, Gold-rated version of the CX750 -
http://www.corsair.com/en/cs-series-modular-cs750m-750-watt-80-plus-gold-certified-psuI thought it would have 4 separate PCIe cables but there are in fact only 2 cables, with 2 PCIe plugs on both....

Should I 100% get a refund and buy something else, or will the above be ok?
I'm at the stage now where I just want to get it powered and running.
I can tell you for sure this one has SIX separate PCIe two built in with plugs attacked if you don't mind that and 4 separate PCIe you can plugs four more PCI plugs into. it comes with all the plugs you need.
http://www.amazon.com/gp/product/B0090I9W66?psc=1&redirect=true&ref_=oh_aui_detailpage_o08_s00 but it cost a ton now i see i have two i got a deal on back 7 month ago for 90 each brand new.

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wow 399 $ for a new one and 105 $ for used .There are nice I can say that, but 399 $ for a new one .I guess i was just lucky.