Well, way I see it...if yer gonna spend $15.00 or more...buy a small motorcycle cable, when it comes to braking power I tend to avoid skimping...since it's my own arse on the line there.
But if you wanna get off cheap, yeah, bicycle cable works pretty good too...make sure to save the adjustors from the old cable (even if you hafta cut em off) if you are going to go that route, however.
-Ree