Cables do make a difference, BUT the real differences are noticeable between a passive guitar and whatever the first active device is. If you have a buffer in your guitar, then cable makes FAR less difference because not only is the pickup buffered (isolated) from the cable preventing any interaction with the pickup, but also the buffer's output impedance is VERY low meaning that there is far less reactance with the cable.
It's true that you really can hear differences among cables, and it's proven that capacitance is not the only factor. Copper purity, grain length, gauge, strands, plating, insulator, shield wire, shield wrap or braid pattern, and many more factors seem to contribute to this. BUT these sonic differences are nearly undetectable after the signal has been made active and driven at low impedance. So the good thing for us using buffers and the OBEL loop setup is that we really don't need to spend our money on exotic cable, good cable will do.
That being said, if you want some killer patch cables, seriously good and also convenient to work with, check out the Evidence Audio "Monorail". http://www.evidenceaudio.com//product.html
It works with the George L's solderless plugs. Great for pedalboards and patch cables. Evidence apparently makes some great sounding cable. I think it's David Gilmour and maybe Kimock who dig the Lyric cable made by Evidence. It's interesting that it uses a solid (not stranded) core conductor, kind of like video cable.
So if your guitar has no buffer, then sure, go for the highly rated exotic stuff. If buffered, save your money.