There shouldn't be a tonal difference, assuming the cable is decent. DECENT. Much of what you're paying for in "better" cables are better connectors (not some cheapo, molded-on-the-end POS that will break off the first time someone tugs on it) and just a generally higher-quality cable. There should not be an audible difference between a 'cheap' cable (again, assuming it meets the 'minimum requirements' of a decent cable) and a more pricey cable.
That all said - In the long run, if you buy cables that are manufactured from better parts (Belden, Canare, ProCo cabling, Switchcraft or Neutrik connectors, etc.), you'll buy less cable - as you won't have to replace them every few months.