Which ones should I get?

I'm far, far too lazy to do it myself.

I'm getting the Asus Z170-Deluxe to match my colour scheme, got brand new ML 140's for everything and getting white Corsair Vengeance LPX so I'm matching smart like.

https://www.overclockers.co.uk/bitfenix-alchemy-2.0-psu-cable-kit-csr-series-black-and-white-cm-251-bx.html

or

https://www.scan.co.uk/products/cablemod-power-supply-premium-cable-kit-for-corsair-c-series-rmi-and-rmx-series-psus-black-white

siding with bitfenix at the moment tbh
just gotta get some white/black SATA data cables after bro

Cablemod configuator (can do them however you want and custom lengths)

Very well done no heatshrink showing either.

Bitfenix has no heatshrink also dude

How much is the cost difference stock vs custom?
Looks expensive as shit when I was looking at mdpc and cablemod a few years ago...

It is expensive. Custom aesthetics ain't cheap. XD

yes it is.
do it yourself for 30$

do it for me for $50

sure but you pick them up in person.

You damn meddling kids...

only a skip across the pond.

If im not mistaken they use double sleeves. The whole reason cablemod is so expensive is cause they do more than just generic colors/custom length cables.