Buy your own router.
Rent for your ADSL line (it's a subscription without contracts) is similar to your ISP subscription (although not 100% the same)
I am with you, but at the moment my Telkom voice line is on Prepaid.
I pay R130 per year to receive calls. I hardly use the line.
If I go on ADSL then I am forced to pay Telkom rent on my voice line. (I think R131 per month).
I will wait until the end of October and see what iBurst has to offer us, maybe they will surprise us...