Looking for a PSU and cable management advice (SATA cables)

[Subadaga]

I just installed a fourth hard drive in my PC and noticed... damn, that's a lot of cables. (Case: Corsair 760T)

But the problem is that my power supply, (RM650 by Corsair) has terrible cables, difficult to bend and handle
and it worries me that someday a SATA connector might break.

So I'm looking to buy another power supply, maybe the Corsair cable Kit (but is it worth it? looks expensive to me https://amzn.com/B00BJMDIDY)
or any other power supply that includes cables easy to bend and handle, anything from 650w to 850w.

Also a good SATA cable.

You can take a look at my cable mess here http://imgur.com/a/NAbuB

Thanks.