Not sure if I agree with my friend Syntax: important ok
but 'most important'? Anyway he is not very specific. You have basicaly the choice between the silver and the copper wire.There are people who swear by silver but also those who hate silver wire. Then there are huge price diferences
inside and between both categories. I assume that you are not willing to pay $1000 for the wire meant for a tonearm of, say, $300? The (huge) advantage of Rega is the construction which allows for an easy access to both: the tube and the collar. If you are skilful with the soldering iron you can do this job yourself. There is no cheaper way
to my knowledge to rewire an Rega tonearm. You can find all the needed info on the internet.