Do not use wire or cable -its much too stiff and can damage beads, its used a lot because its easy but it isnt usually a good solution for the job.
I use the maximum size of very strong coloured nylon spun thread or a mixture of many threads together, it makes nice knots and cushions the beads properly, gives the necklace a nice soft feel and hangs well. Thin stiff wire through large holes makes the beads rub against each other causing it to look clumsy and it damages the beads.