Good speaker cables should not make a difference in sound. If they do, they are failing their duty. The simplest way to get good sound is plain vanilla cables in sufficient thickness, esp for longer lengths. Ideally, get them with connectors already fitted, and from a pro audio store. That way you will not get ripped off by all the snake oil sellers. Just use what the pros use. Unfortunately most home audio amplifiers and speakers do not use the Neutrik connectors as per most pro audio gear.
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Cables are nothing more than tone controls for most high end systems AND you already have that with your pre amp. So I would wire the whole system with Kimber Kable. Use 12tc for the speaker wire, and a Hero IC or even a PBJ (very good for the money). Kimber cables sound very nuetral , open and uncolored across the whole spectrum. Also, you could go with some cables from Signalcable.com , you can call them or order off their website, very affordable and very uncolored once broken in, sounding very detailed,open, clean, clear and fast.
Speakers to replace your KEF’s? I would look at speakers that are Warmer/Darker sounding (Sansui tends to be a bit brite) like some JBL Century 100's (1k to 2k used price, these are the speakers if you can find them) , or Acoustic Research or Klipsch (old classic brands). Newer speakers like Martin Logan (non ESL’s) or Vandersteen and Kef’s own concident "1 driver does it all" technology might be on the list (LS50), Epos, or Totem Acoustics (signature one) with good stands for more refinement in sound. Good luck!
See here for some cable science: http://www.roger-russell.com/wire/wire.htm#introduction
If you will ever plan to upgrade the speakers, consider Harbeth. At their various price/size points I think they are probably the best dynamic speakers in the market, with a classic sweetness and clarity. For me, they are the only dynamic speakers that come close to my Quad electrostats, even if I have obviously not listened to every speaker on the market (and do not intend to do as I am all set for the next decade or more).
I’m surprised no one has mentioned it, but there is a duelund reproduction of old Western electric speaker cables and loads of people have been giving them rave reviews, even on new systems. Seems like a no brainier that they’d match up well with an old sansui. I have a great sansui integrated amp. It sounds beautiful.. good on you, knowing what you want in a system and going after it.
Anyway, the duelund can be found at parts connexion reasonably cheaply. It is a tinned copper cable, in cotton insulation, I believe. Good luck!